Protocols

Protocols is:
The standards that specify how the network functions
0r
The set of rules for communication over the network
or
The language or the grammar that allows computers to “talk” to each other.
The Internet uses many protocols

for example /((FTP)):

File Transfer Protocol.
Used to transfer data from one computer to another over the Internet, or through a network.
Example - create a website on your machine; use FTP to copy the site to the web server; now everyone can use the site.
Then use FTP to update the files as you maintain the site.