Differences and application scenarios between UDP and TCP, HTTP, HTTPS, and SOCKS5 protocols

Differences and application scenarios between UDP and TCP, HTTP, HTTPS, and SOCKS5 protocols:

UDP (User Datagram Protocol):
Difference: UDP is connectionless, does not guarantee the order or integrity of data packets, and has no flow control or congestion control mechanism. It sends data packets from the source host to the destination host as quickly as possible, but does not guarantee that each data packet can arrive or be received in the order sent.
Application scenarios: Suitable for applications with high real-time requirements and tolerance for a certain degree of packet loss and disorder, such as online video conferencing, live streaming, VoIP (Internet phone), online games, etc.
TCP (Transmission Control Protocol):
Differences: TCP is connection-oriented and provides reliable data transmission services. It establishes a connection through a three-way handshake and ensures that data is delivered correctly and in order through sequence numbers, confirmation responses, and retransmission mechanisms. TCP also has flow control and congestion control functions, and can dynamically adjust the data transmission rate to adapt to network conditions.
Application scenarios: Suitable for applications with high requirements for data integrity, such as Web browsing (HTTP/HTTPS based on TCP), email (SMTP, POP3, IMAP4 usually use TCP), file transfer (FTP), etc.
HTTP (Hypertext Transfer Protocol):
Differences: HTTP is an application layer protocol. It is based on the TCP protocol in the TCP/IP model. It defines a standard format for requests and responses between clients and servers. It is mainly used to transmit web page content and other resources. HTTP is stateless and each request is processed independently.
Application scenarios: Widely used in information exchange on the World Wide Web (WWW), including web browsing, API calls, file downloads, etc.
HTTPS (Hypertext Transfer Protocol Secure):
Difference: HTTPS is based on HTTP, but adds the SSL/TLS encryption protocol at the transport layer, providing a secure communication channel that can protect user privacy and data security and prevent eavesdropping and tampering.
Application scenarios: Any web application that needs to protect user privacy and data security, such as online banking, e-commerce, login authentication pages, sensitive information submission, etc.
SOCKS5:
Difference: SOCKS5 is a universal proxy protocol that works at the session layer or transport layer, supports multiple upper-layer protocols, can provide transparent forwarding services between different types of networks, and allows clients to access various services on the Internet through proxy servers, not just HTTP services.
Application scenarios: Network access across firewalls, anonymous browsing, remote access to internal network resources, online game accelerators, etc. SOCKS5 proxy can be used for multiple application protocols such as HTTP, FTP, SMTP, etc.