This computer science video follows on from the video that introduces logic gates. It covers creating truth tables for combinations of simple logic gates, including a mention of some well used combinations. Combinations of logic gates manipulate pulses of electricity, and because these pulses represent binary 1s and 0’s, combinations of logic gates can perform useful data operations such as comparing values, performing arithmetic and even storing data. Being able to create truth tables for combinations of logic gates is an extremely important aspect of computer circuit design, because truth tables can help us to see how circuits work.