I have been working on scripting for quite some time now. BUT I came
across this style of script:

script.sh* . Why does this " * " come into picture? Only difference I
see between script.sh and script.sh* is we dont need any sh to run the
script.sh*.

Does this" * " make it executable . If yes how do we get this " * " in
normal scripts.

Is it just by changing the permissions to execute ( chmod x script.sh)?

Thanks