Case Sensitive

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Case Sensitive means that the case of a letter matters: there is a difference between the lowercase version of a letter and the uppercase version of the same letter.

The following items are usually not case sensitive:

The following items usually are case sensitivie:

  • Directories and file names
  • Web server directories (i.e., folders) and web pages names
  • Passwords


Passwords are usually case-sensitive, so "password", "Password", "PassWord", and "passWord" would all be considered different passwords.

Top level domains are not case-sensitive, so "", "WWW.EXAMPLE.COM", and "" would all point to the same website.

However, web site directories and web page names are case sensitive:

  • "" and "" point to different directories.
  • "" and "" are different web pages

Because of this, many content management systems automatically default all directories and web files to lowercase.