Taking A Closer Look At The WordPress wp-config.php File
Some people will never touch the file that sets the most important details that make a site unique: wp-config. In fact, since WordPress automatically creates the file during its famous “5 minute installation” a lot of users don’t even know it’s there or ever need to touch it. That’s a great thing.
Most, but not all of what you do in wp-config is set the values of constants, so it’s important to understand constants, before discussing wp-config. Constants are a type of identifier, that like a variable holds a value. The big difference between a constant and variable, is that once a constant is defined, its value can not change. They are like non-variable, variables. Taking A Closer Look At The WordPress wp-config.php File