system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do digital clocks get "off" over time?

I have to reset the clock in my car every few months because it'll be 3-4 minutes behind. How does this happen?
gpt
Digital clocks have a small device that vibrates in order to keep time. The clock is manufactured to know how many vibrations are in 1 second. However its never exact. It could actually be 1.0000001 seconds or 1.01 seconds or .999 seconds. So over time. Those very tiny errors add up to a couple extra minutes.