Before Object Oriented Programming
(OOP) was popular, computer software was written in a Procedural style.
This meant that the application was divided into a large number of procedures. C is largely procedural, and to a certain degree C++ and C# are as well.
A popular design methodology was "Structured Programming" but that has been rendered obsolete by OOP.
Also Known As: Modular Programming
Object Oriented Programming is completely different from Procedural Programming.