Network and Communication Protocols

Protocol	Full Name	Layer / Type	Primary Use Case	Key Advantage
HTTP / HTTPS	Hypertext Transfer Protocol (Secure)	Application	Standard web browsing and REST APIs	Universal support, secure encryption
HTTP/3	Hypertext Transfer Protocol Version 3	Application	Next-generation web browsing and fast API data	Eliminates head-of-line blocking via QUIC
WebSockets	WebSockets Protocol	Application	Bidirectional, real-time web applications	Low latency, continuous two-way communication
SSE	Server-Sent Events	Application	Unidirectional real-time data streaming	Built-in HTTP reconnects, great for LLMs
gRPC	Google Remote Procedure Call	Application	High-performance microservice communication	Ultra-fast binary serialization
WebRTC	Web Real-Time Communication	Application	Peer-to-peer audio, video, and data feeds	Direct browser-to-browser streaming
MQTT	Message Queuing Telemetry Transport	Application	Lightweight IoT device messaging	Low power, works on unstable networks
CoAP	Constrained Application Protocol	Application	Power-constrained IoT automation	Low overhead, translates easily to HTTP
AMQP	Advanced Message Queuing Protocol	Application	Enterprise message queuing and routing	Highly secure, transactional message delivery
SMTP	Simple Mail Transfer Protocol	Application	Sending and routing emails between servers	Universal standard for email transmission
IMAP	Internet Message Access Protocol	Application	Retrieving and syncing emails across devices	Keeps mail state synchronized on the server
FTP / SFTP	(Secure) File Transfer Protocol	Application	Transferring large files between systems	SFTP provides secure, encrypted file transfers
DNS	Domain Name System	Application	Translating domain names to IP addresses	Crucial foundational routing map of the web
TCP	Transmission Control Protocol	Transport	Reliable, connection-oriented data delivery	Guarantees packet order and error checking
UDP	User Datagram Protocol	Transport	Fast, connectionless packet delivery	No handshake delay, ideal for live gaming
QUIC	Quick UDP Internet Connections	Transport	Modern multiplexed stream transport	Faster connection establishment than TCP + TLS
IP (IPv4 / IPv6)	Internet Protocol	Network	Core packet addressing and routing	Delivers data from host to destination

Important Note

Application-layer protocols (HTTP, gRPC, MQTT, SMTP, etc.) define how applications communicate, while transport-layer protocols (TCP, UDP, QUIC) determine how data is delivered across the network. IP (IPv4/IPv6) operates at the network layer and is responsible for addressing and routing packets between hosts.