And if the name consists of multiple words, run them together and capitalize each new word. Some variables may not need to be changed throughout the code. They may only be needed as placeholders. If the value is going to stay constant, you can differentiate these variables by making them all upper-case, and separate different words with underscores. This also a naming convention and not required.
Constants can replace literal values.
Literals are hard coded values. Using constants will help to make the code easier to follow and understand.