“Case sensitive” is a term indicating that text is sensitive to letter case, meaning it distinguishes between uppercase and lowercase letters.
We’ll see how it works in practice by looking at the situations below:
Case Sensitive
texto is different from Texto, because the second word starts with a capitalized consonant.
Case Insensitive
texto is the same as Texto, there is no distinction between letter cases.
A related concept joins words and capitalizes the letters at the beginning of each word, called CamelCase.