SMTP stands for Simple Mail Transfer Protocol. It's a protocol used in the process of sending and receiving emails. SMTP is responsible for the transmission of emails between servers.
Example:
When you send an email, your email client (like Outlook or Gmail) uses SMTP to communicate with the email server. The SMTP server is responsible for sending your email to the recipient's email server. If you're sending an email from your Gmail account, for example, Gmail's SMTP server handles the process of routing your email to the recipient's email server.
In a nutshell, SMTP is the behind-the-scenes technology that enables the sending of emails across the internet.
