For a full overview of MongoDB and all my posts on it, check out my overview.

WARNING! This is a dangerous command that will result in the loss of data

If you want to completely drop a collection, which will result in the loss of all documents in that collection, there is one simple command to do that called drop.

To drop a collection in your MongoDB instance called podcasts:

db.podcasts.drop()

Only do this if you're sure you want to completely reset that collection.