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docs/glossary.md

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+# Glossary of QMK terms
+
+git
+: versioning software used at the commandline
+
+keymap
+: an array of keycodes mapped to a physical keyboard layout, which are processed on key presses and releases
+
+matrix
+: a wiring pattern of columns and rows (and usually diodes) that enables the MCU to detect keypresses with a fewer number of pins