When strike price is less than the spot price of the underlying, then call option is said to be in the money option.
Difference between the spot price and the strike price creates intrinsic value.
When exercising of call option at the strike price (without premium) creates an intrinsic value, the option is said to be In The Money.
For Instance. Call options, if spot price is 3000, then strike prices of 2950 and 2900 are provide In The Money Options, where intrinsic value is Rs 50 & Rs.1000 respectively.