What is a DMR “code plug”?

In the context of Digital Mobile Radio (DMR), a "code plug" is simply a digital file containing configuration data for your radio. It programs the radio's memory channels, scanning lists, repeater frequencies, color codes, and talkgroups. The term originated in the early days of commercial two-way radios, where a physical hardware plug containing a memory chip was manually inserted into the radio. Today, the process is entirely software-based. Distractors might suggest it's a physical adapter cable or an analog-to-digital codec, but modern "code plugs" are just the settings files you build on a computer and transfer to the radio.