Answer 1

i too cant describe namespace too deep,but still here u go:
std is having your cout object,to use it u had to use std::cout<<"blah blah"; but to make things faster and easier,u use namespace std declaration once and use simply cout<<"blah blah"; when ever required.in short,it saves ur time by writing cout<<"blah blah"; instead of std::cout<<blah blah""; everytime.😄😄😅