when ever a program is to be compiled the syntax is
necessary and we wont receive the output until a correct
syntax is written 
it shows the errors so debugging becomes easier
the best example is C language

where as in interpreter if we miss any syntax it violates
that particular line and goes to the next line
in this case we may or may not get the required output
it does not show any errors even though its violates the syntax
the best example is HTML