SMTP (Simple Mail Transfer Protocol) is a standardized communication protocol used for sending and receiving electronic mail (email) over the internet. It is responsible for the reliable and efficient delivery of emails from one computer to another, allowing users to easily communicate and exchange information across different networks and devices. SMTP works by establishing a connection between the sender’s email server and the recipient’s email server, and then transferring the email message through a series of intermediate servers until it reaches its final destination. This protocol also includes error checking and authentication mechanisms to ensure the security and integrity of the email transmission. In short, SMTP is the backbone of modern email communication, making it possible for people to stay connected and informed in today’s digital world.