Difference between compiler and interpreter

A compiler is a program that translates program (called source code) written in some high level language into object code. The compiler derives its name from the way it works, looking at the entire piece of source code and collecting and reorganizing the instructions. A compiler translates high-level instructions directly into machine language and this process is called compiling
An interpreter translates high-level instructions into an intermediate form, which it then executes. Interpreter analyzes and executes each line of source code in succession, without looking at the entire program; the advantage of interpreters is that they can execute a program immediately. Compilers require some time before an executable program emerges. However, programs produced by compilers run much faster than the same programs executed by an interpreter.
Compiled programs generally run faster than interpreted programs. The advantage of an interpreter, however, is that it does not need to get through the compilation stage during which machine instructions are generated. This process can be time-consuming if the program is long. The interpreter, on the other hand, can immediately execute high-level programs. For this reason, interpreters are sometimes used during the development of a program, when a programmer wants to add small sections at a time and test them quickly.