In computing, a process is an instance of a computer program that is being executed. It contains the program code and its current activity. Depending on the operating system (OS), a process may be made up of multiple threads of execution that execute instructions concurrently.
A computer program is a passive collection of instructions; a process is the actual execution of those instructions. Several processes may be associated with the same program; for example, opening up several instances of the same program often means more than one process is being executed.
Ну и
Application software is all the computer software that causes a computer to perform useful tasks beyond the running of the computer itself. A specific instance of such software is called a software application, application program, application or app.
The term is used to contrast such software with another type of computer program referred to as system software, which manages and integrates a computer's capabilities but does not directly perform tasks that benefit the user. The system software serves the application, which in turn serves the user.
Примерно так. Готов выслушать иную точку зрения.
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stranger пишет:требуют памяти больше, чем при работе.
Памяти требуют приложения, амиго. Чтож вы все такие деревянные?)
Разберитесь с терминами пожалуйста. Проверочный материал выше, буквари в Интернете. После того с удовольствием выслушаю Ваше мнение! 
