Look up any process name
Press ⌘F and type any name you’ve seen, such as mds_stores.
Seen a strange name in Activity Monitor? Press ⌘F (or the search button) and type it, for example mds_stores or WindowServer. Procession shows what it is, why it might be busy, what happens if you stop it, and whether it’s running now.
Procession’s guide has over 200 entries. Every process Procession explains