What is difference between interpreter and compiler?

Both compilers and interpreters are used to convert program written in high level language into machine code understood by computers.
Interpreter converts program one statement at a time, takes less time in analyzing source code, slower than compiler, there is no intermediate object formed, hence memory efficient.
Compilers scans entire program and then converts it as a whole into machine language, takes more time analyzing source code, however it is faster than interpreter, generates intermediate object code hence takes more memory.
Programming languages like JavaScript, Python and Ruby use interpreters.
Programming languages like C, C++ and Java use compilers.