What is the meaning of server-side coding ?

Answer 1

server side coding is the language used to function on the server . It performs the actions based on your scripts over the server.
for example php is a server side language which your browser can't understand directly. first is needs to be converted by the php engine which usually resides on the server. the php engine converts the language so that the browser can understand it.
on the other hand HTML CSS and JS are client side languages which the browser easily understand .

Answer 2

The process of writing set of instructions to your computer so that people will connect and grab data from it