Technical Glossary
A defined set of protocols, routines, and tools that specifies how software components should interact, enabling interoperability between disparate systems and services. APIs abstract underlying implementation complexity, exposing only the operations and data formats required for integration. They serve as the foundational connectivity layer in modern platform architectures, supporting RESTful, GraphQL, and gRPC communication patterns. Industry standards from IETF and W3C govern API design principles for web-based systems.
An architectural paradigm in which application functionality is decomposed into discrete, loosely coupled services that communicate through standardized messaging protocols. SOA enables platform connectivity by allowing heterogeneous systems to exchange data and invoke operations across organizational boundaries. Enterprise service buses and middleware layers orchestrate service interactions, supporting protocol translation and message routing. The OASIS reference model provides formal governance for SOA design and implementation.
An architectural style for distributed hypermedia systems that employs stateless client-server communication using uniform resource identifiers and standard HTTP methods. REST constrains component interactions through a set of principles including cacheable responses, layered system architecture, and a uniform interface. RESTful APIs have become the dominant connectivity pattern for web-based platforms due to their simplicity and scalability. The style was originally defined in Roy Fielding's doctoral dissertation and formalized through IETF HTTP specifications.
A communication protocol providing full-duplex, bidirectional communication channels over a single persistent TCP connection between client and server endpoints. WebSocket eliminates the overhead of repeated HTTP handshakes, enabling real-time data streaming essential for live dashboards, collaborative editing, and IoT connectivity platforms. The protocol begins with an HTTP upgrade handshake before switching to the WebSocket framing format. It is standardized by IETF RFC 6455 and the W3C WebSocket API specification.
A lightweight publish-subscribe messaging protocol designed for constrained devices and low-bandwidth, high-latency networks in machine-to-machine and Internet of Things connectivity scenarios. MQTT uses a broker-mediated architecture where clients publish messages to topics and subscribe to receive messages matching topic filters. The protocol supports configurable quality-of-service levels ranging from at-most-once to exactly-once delivery guarantees. It is standardized as an OASIS specification and widely adopted in industrial IoT connectivity platforms.
An authorization delegation protocol that enables third-party applications to obtain limited access to web services on behalf of resource owners without exposing credentials. OAuth 2.0 defines grant types including authorization code, client credentials, and device flows that accommodate diverse connectivity scenarios across platforms. The framework separates the roles of resource owner, client, authorization server, and resource server to enforce least-privilege access patterns. It is standardized in IETF RFC 6749 and extended by numerous companion specifications.
A query language and runtime for APIs that enables clients to request exactly the data they need, eliminating over-fetching and under-fetching inherent in traditional REST endpoints. GraphQL uses a strongly typed schema to define available data operations including queries, mutations, and subscriptions for real-time connectivity. The specification supports introspection, allowing platform consumers to discover available fields and types programmatically. Originally developed at Facebook, it is now governed by the GraphQL Foundation under the Linux Foundation.
A high-performance, open-source framework for remote procedure calls that uses HTTP/2 for transport, Protocol Buffers for serialization, and supports bidirectional streaming between connected services. gRPC enables efficient inter-service connectivity in microservice architectures through strongly typed service definitions and automatic client-server code generation. The framework supports authentication, load balancing, and deadline propagation across distributed platform components. It is maintained by the Cloud Native Computing Foundation as part of the modern connectivity infrastructure stack.
A dedicated infrastructure layer for managing service-to-service communication in microservice deployments, implemented through sidecar proxies that handle traffic routing, load balancing, and observability without modifying application code. Service meshes provide platform-wide connectivity policies including mutual TLS encryption, circuit breaking, and canary deployment strategies. The control plane manages proxy configuration while the data plane handles actual network traffic between services. Frameworks like Istio and Linkerd are maintained under CNCF governance for cloud-native connectivity.
A software design paradigm in which the flow of program execution is determined by events such as state changes, user actions, or sensor outputs, enabling asynchronous communication between loosely coupled platform components. EDA uses event brokers, channels, and processors to decouple producers from consumers, supporting scalable connectivity patterns in distributed systems. This architecture facilitates real-time data processing, complex event correlation, and eventual consistency models across interconnected services. The AsyncAPI specification provides a standardized way to define event-driven interfaces.
A server component that acts as the single entry point for all client requests to a platform's backend services, performing request routing, composition, protocol translation, and cross-cutting concerns such as authentication and rate limiting. API gateways abstract the complexity of microservice topologies from external consumers, providing a unified connectivity interface. They support traffic management features including load balancing, caching, and request throttling to protect downstream services. Industry implementations follow patterns defined by the CNCF and IETF HTTP gateway specifications.
A cryptographic protocol providing end-to-end encryption, data integrity verification, and server authentication for communications over computer networks, forming the security foundation of platform connectivity. TLS operates between the transport and application layers, negotiating cipher suites and establishing shared session keys through an asymmetric key exchange handshake. The protocol protects against eavesdropping, tampering, and message forgery across all connected platform endpoints. TLS 1.3, standardized in IETF RFC 8446, significantly reduces handshake latency and removes legacy vulnerable algorithms.
An HTTP callback mechanism in which a server pushes real-time event notifications to a client-specified URL endpoint when a predefined condition or state change occurs, inverting the traditional polling-based connectivity model. Webhooks enable efficient platform integration by eliminating the need for continuous API polling, reducing network overhead and latency in event propagation. Implementations typically include payload signing using HMAC for authentication and retry logic with exponential backoff for delivery reliability. The Standard Webhooks specification provides interoperability guidelines for webhook implementations across platforms.
A language-agnostic, machine-readable interface definition standard for describing, producing, consuming, and visualizing RESTful APIs without requiring access to source code or additional documentation. OpenAPI enables automated generation of client SDKs, server stubs, and interactive documentation, streamlining platform connectivity onboarding for developers. The specification defines API endpoints, request-response schemas, authentication methods, and operational metadata in YAML or JSON format. Governed by the OpenAPI Initiative under the Linux Foundation, it has become the industry standard for API documentation.
An interoperability model in which independent platform instances cooperate through standardized protocols to share resources, identities, and data while maintaining autonomous governance and operational control. Federation enables cross-platform connectivity without centralized authority, supporting distributed architectures where each node retains sovereignty over its policies and user base. Implementation patterns include federated identity management, distributed data queries, and cross-instance messaging using protocols like ActivityPub. Standards from W3C and IETF provide the protocol foundations for platform federation in both social and enterprise contexts.