Question

what is h parameter

Answer 1

Small signal hybred two port model of a transistor.
hie is the input resistance
hoe is the output conductance
hfe is current gain from input to output
hre is the reverse voltage gain from output to input
you should see text in the developement of these parameters.

Answer 2

h parameters are known as hybrid parameters
https://en.wikipedia.org/wiki/Two-port_network
paste the link on address bar ,ur concept will be preety clear