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+# Overview
+
+When defining a [keymap](keymap.md) each key needs a valid key definition.
+
+This page documents the symbols that correspond to keycodes that are available to you in QMK.
+
+## Basic keycodes (`0x00` - `0xFF`)
+
+[Basic keycodes](basic_keycodes.md) in QMK are based on [HID Usage Keyboard/Keypad Page(0x07)](http://www.usb.org/developers/hidpage/Hut1_12v2.pdf) with following exceptions:
+
+* `KC_NO` = 0 for no action
+* `KC_TRNS` = 1 for layer transparency
+* internal special keycodes in the `0xA5-DF` range (tmk heritage).
+
+## Quantum keycodes (`0x0100` - `0xFFFF`)
+
+[Quantum keycodes](quantum_keycodes.md) allow for easier customisation of your keymap than the basic ones provide, without having to define custom actions.