If you're interested in options trading, one of the first things to learn is the difference between call and put options. You'll see these terms used all the time, so understanding them is a must.

Call options grant buyers the right, not obligation, to purchase an asset at a specified price before expiration. Conversely, ...

A put/call ratio is a sentiment indicator that compares the number of bearish put options sold on an asset to the number of bullish call options, usually over the period of one trading day.