# Keymap Overview
-OMK keymaps are defined inside a C source file. The data structure is an array of arrays. The outer array is a list of layer arrays while the inner layer array is a list of keys. Most keyboards define a KEYMAP() macro to help you create this array of arrays.
+QMK keymaps are defined inside a C source file. The data structure is an array of arrays. The outer array is a list of layer arrays while the inner layer array is a list of keys. Most keyboards define a KEYMAP() macro to help you create this array of arrays.
## Anatomy Of A `keymap.c`