system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does UV light kill bacteria, and why is it used for cleaning things?
gpt
Ultra-violet light can ionize the DNA in cells and break it down, disrupting cell function and eventually killing the bacteria. It also creates small amounts of ozone which can do serious damage to cells.

It's used for cleaning because it's a fairly non-invasive way of disinfecting surfaces that doesn't require any toxic or damaging chemicals.