getline is used to read an entire line of text from an input stream, which is useful for processing input that contains spaces.

Usage:

1. Basic Usage:

   std::string input;
   std::getline(std::cin, input);
   
   

2. With Custom Delimiter:

   std::string input;
   std::getline(std::cin, input, ','); // Reads until a comma is encountered
   
   

3. For Loop Input:

   string s;
   int t;cin>>t;
   cin.ignore(); // to ignore the '\\n' from the first line after taking the input t;
   while(t--){
   	std::getline(std::cin, input); 
   }