WordPress skeleton is mainly depends upon four parts. Header, footer, sidebar and the loop to show posts. WordPress footer is usually the bottom section of website where you present your copyright notice, any legal terms and conditions and other related information.
Footer area usually remains static throughout the whole website and display static information. However modern WordPress themes incorporate menus, pages and even widgets to show in footer area making it dynamic instead of showing static information all the time.
Usually good themes always offer ways to change footer text and other information from Appearance > Customize menu.
WordPress file footer.php is the file responsible for configuration of footer area. Footer.php location is the theme’s folder you are using. You don’t need to access this file unless or until you have to change anything manually.
The most common question people ask is how to change WordPress credits text in footer. See our detailed step-by-step article How to remove Proudly Powered by WordPress Footer