What is asterisk??

Answer 1

it's this little star: *

Answer 2

multiplication. 2*2=4 or exponentation 2**7=128

Answer 3

it is just a symbol ' * ' which is used in number of ways in various programming languages for example in multiplication as 2*2=4,in exponential evaluation as 2**3=8,in declaring pointers as int * x =&a , somewhere as a wild character to substitute all missing characters in search of a file name, as a kleen star in theory of computation and so on.... !