Difference between a source code and object code
A source code is an instruction which is written using memory aids or mnemonics. Memory aids or mnemonics are instructions written in the programming language which can only be interpreted directly by the programmer.
An object code is an instruction which has been translated into a machine code or machine readable form by use of a specialised translation program called compilers, which translate a source code to a machine code before it can be used by a computer.