Here i write in single line difference between NPN and PNP Transistor. full review will be added in later post.
NPN transistor is the type of p-type bipolar transistor to be applied between two n-type semiconductors. Electrons are the most important vectors in the NPN transistor.
The base p is connected to the negative potential of the NPN.
PNP is the type of bipolar transistor consisting of a n-type semiconductor connected between two p-type semiconductors. The holes are the most important vectors in the PNP transistor.
In NPN, the n-type base is connected to the positive terminal.