Compiler is used to translate the high-level language 
program into machine code at a time. It doesn't require 
special instruction to store in a memory, it stores 
automatically. The Execution time is less compared 
to Interpreter.

A compiler is s/w which converts high level language into 
machine language.The compiler convert "whole program at a 
time".Example "c" uses complier.The execution time is less 
in complier.

compiler is a program which translate one language (source 
code)to another language(target code).
sometimes comiler is called as linker,debuger,lode and go.

A compiler is a special type of computer program that 
translates a human readable text file into a form that the 
computer can more easily understand. At its most basic 
level, a human will operate very slowly and find the 
information contained in the long string of 1s and 0s 
incomprehensible. A compiler is a computer program that 
bridges this gap.
Some compilers are multistage or multiple pass. A first 
pass could take a very natural language and make it closer 
to a computer understandable language. A second or even a 
third pass could take it to the final stage, the executable 
file.