Used to ask or show a choice from a group of things or people. It points to one or more specific options that are already known.
From Old English 'hwilc' or 'hwylc', meaning 'who-like' or 'what-like.' Over time, sound changes turned 'hw-' into the 'wh-' spelling and the word into modern 'which.'
Many 'wh-' words used to start with an 'hw' sound, which you can still hear in some accents. 'Which' is like a mental finger, pointing at one item from a set you already have in mind.
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