EOT is a file extension used for files that stored font data used by Internet Explorer web browser. EOT files were introduced along with the fourth version if IE, only to be replaced by other format in IE 9.

EOT file specification was developed by Microsoft. The main purpose of EOT files was to store TrueType TTF fonts in a format compatible with Internet Explorer. EOT files standardized and unified font display to ensure users see documents as intended by the designer.