Bull Spread

Is a strategy used when an options trader expects an increase in the price of an underlying asset.

Bull Call Spread

Also known as a Long Call Spread or Debit Call Spread
This is a type of options trading strategy that involves two call options.
Buying the lower-strike call and selling the higher-strike call.

Bull Put Spread

Also known as a Short Put Spread or Credit Put Spread.
This is a type of options trading strategy that involves two put options.
Selling the higher-strike put and buying the lower-strike price put.