What are sockets and what types are there?.

Sockets are a programming interface for organizing network interaction between processes, often between different computers. They allow applications to exchange data over a network using various protocols.

Main types of sockets:

• Stream sockets (TCP) — provide reliable, connection-oriented data transfer. Used for the TCP protocol.
• Datagram sockets (UDP) — provide message transfer without establishing a connection, without delivery guarantees. Used for the UDP protocol.
• Raw sockets — allow working with network protocols at a low level, for example, to implement custom protocols or analyze traffic.

In Go, the net package is used for working with sockets. Example of creating a TCP server:

package main

import (
    "fmt"
    "net"
)

func main() {
    ln, err := net.Listen("tcp", ":8080")
    if err != nil {
        panic(err)
    }
    defer ln.Close()

    for {
        conn, err := ln.Accept()
        if err != nil {
            fmt.Println("Error accepting connection:", err)
            continue
        }
        go handleConnection(conn)
    }
}

func handleConnection(c net.Conn) {
    defer c.Close()
    buf := make([]byte, 512)
    n, err := c.Read(buf)
    if err != nil {
        fmt.Println("Error reading:", err)
        return
    }
    fmt.Println("Received:", string(buf[:n]))
}

Thus, sockets are a fundamental mechanism for network interaction, and their types determine the method and reliability of data transfer.