Protocols

Protocols

1. Standard Protocols

   • Protocols only work if both ends of the communication are using the same one.
   • There is little point inventing your own protocol, as no other systems will understand it.
   • Standard protocols are well known protocols that are used by a wide variety of applications.
   • If you write a program that uses (for example) the HTTP protocol, you know it will work with all web-servers in the world.

2. HTTP and HTTPS

   • HTTP (Hyper Text Transfer Protocol) is the standard protocol used for requesting an HTML file from a web-server.
   • All browsers (Firefox, Chrome) use the HTTP protocol, as do all web-servers.

3. FTP

   • FTP (File Transfer Protocol) is a protocol for transferring files between two computers.
   • It is commonly used by web developers for uploading their HTML files to their web-servers.

4. POP3 and SMTP