camelCase    Camel case  (stylized as  camelCase ; also known as  camel caps  or more formally as  medial capitals ) is the practice of writing phrases such that each word or abbreviation in the middle of the phrase begins with a  capital letter , with no intervening spaces or punctuation. Common examples include " iPhone " and " eBay ". It is also sometimes used in online usernames such as "johnSmith", and to make multi-word  domain names  more legible, for example in advertisements.     source:  https://en.wikipedia.org/wiki/Camel_case     PascalCase    This is also a very popular way to combine words to form a single concept. It is often used as a convention in declaring classes in many languages.   source:  https://en.wiktionary.org/wiki/Pascal_case#English      Snake_Case     Snake case combines words by replacing each space with an underscore (_) and, in the all caps version, all letters are capitalized, as follows:     snake_cas...