A Long Strangle involves buying an OTM Call at a higher strike and an OTM Put at a lower strike, same expiry. It typically costs less than a Long Straddle (since both legs are OTM), but requires a larger price move to reach breakeven.
Related Reading
See the full formulas and a worked example, compared directly against the Straddle, in Straddle and Strangle Strategies for Volatile Markets.
