camelCase
myVar
Used for variables in most programming languages.
PascalCase
MyClass
Used for class names in Java & JavaScript, amongst other places.
snake_case
my_col
Used in SQL expressions, typically. May or may not be capitalized, also.
SCREAMING_SNAKE_CASE
MY_CONST
Used often for constants, enums, and Environment Variables in frameworks like NodeJS.
UPPERCASE
MYEXAMPLE
Not sure where/if this is really used, in practice. Lack of delimiter between words.
lowercase
myexample
Not sure where/if this is really used, in practice. Lack of delimiter between words.
Sentence case
This is an example
Used by most people in most cases.
Title Case
The Catcher in the Rye
Used for book titles, movie titles, and by me (for some reason) in all sorts of incorrect locations.