Kya koi mughe bata sakta hai ki jab hum apne chote se web project ko open karte hai to usme 127.0.0.1 kyu aata??

Answer 1

127.0.0.1 is address of your local machine.

when you host something on "localhost" it uses this address.
https://www.sololearn.com/discuss/1946811/?ref=app

Answer 2

Basically, it's localhost address or you can say it's the IP address of your local machine in offline mode that behaving like a server for your web project. Localhost address is the same for everyone.