camelCase or camel case is a naming convention often used by software developers. camelCase capitalizes each word except the first. It is used in programming languages where words are often concatenated, making them hard to read. camelCase allows the term to be read easier.
It is important to distinguish the difference between camelCase and PascalCase, PascalCase capitalizes every word including the first, while camelCase does not capitalize the first.
camelCase is occasionally used in branding as well. Most popularly, Apple is known to use camelCase for the branding of its products and operating systems. Some examples include iPhone, iPad, and macOS.