What is the difference between cout<< and cerr<<

Answer 1

Both of the above statements will be en-route the output to the the standard output device i.e., monitor, by default, but semantically both are different in essence that
cout<< represent standard output stream
and
cerr<< represent standard error stream

Answer 2

With cerr<< the output is immediately sent to the standard error stream while cout<< the output first goes to the buffer

Answer 3

@Devender What about clog<<

Answer 4

clog<< is rarely used. In fact is mere a clone of cerr <<