General objective of this lecture is to presentation on Combinational Circuits. Combinational circuit is made of input variables, reasoning gates, and output result variables. The logic gates get signals from the inputs and generate signals towards outputs. Combinational circuits is circuit during which we combine all the gates in the circuit as an example encoder, decoder, multiplexer in addition to demultiplexer. Some from the characteristics of combinational circuits tend to be following: output of combinational circuit at any instant of your time, depends only for the levels present at input terminals, combinational circuit tend not to use any memory, input doesn’t need any effect for the present state from the circuit and combinational circuit can offer a n quantity of inputs and m quantity of outputs.