system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does cheese 'sweat'?
gpt
The 'sweat' is actually oils from the cheese.

Think of the cheese like a sponge holding in water.  When its freezing, the water stays in the sponge.  When it thaws, the water starts leaking out.

Oil has a different boiling and freezing temperature than water.  When you keep cheese in the refrigerator, the oils stays in the cheese easier (Although is may sweat a little over time).  When you take it out, the oils start leaking out.  However, because oil evaporates much more slowly than water, the oils tend to just sit on the surface of the cheese.