Modular code is reusable code. It can be combined in a variety of ways, making it flexible and scalable, allowing you to iterate code blocks independently and leading to better performance and more maintainable sites. Object Oriented CSS (OOCSS), Scalable and Modular Architecture for CSS (SMACSS), Don’t Repeat Yourself CSS (DRY CSS), and Block, Element, Modifier (BEM) are four popular methods for