Horizontal Debit Spread
Definition:

Also known as "time or calendar spread".
May be Neutral, Bullish or Bearish Depending on What Strikes are Used.
Sell In-the-Money, At-the-Money, or Out-of-the-Money Call or Put; Buy the Same Type of Option at  a Same Strike but in a Farther Out Month.

Strategy Type:Neutral, Bullish or Bearish
Risk:Limited
Gain:Limited
Time Decay Effect:Positive
Increasing IV Effect:Positive
Profit/Loss by Change in Underlying Common Price

horizontal debit spread