What is the use of this << and >> in c++

Question

C++

Answer 1

https://www.sololearn.com/learn/4086/?ref=app
https://www.sololearn.com/learn/4087/?ref=app

Answer 2

They are used for insertion and extraction in iostream objects;
<< for oestream (output):
cout << endl;
>> for istream (input):
cin >> var;
Also can overload them for custom behavior.