I was unaware of being placed in the admin group by default. Is the admin group similar to the wheel group or is there also a wheel group for sudo access? And

I was unaware of being placed in the admin group by default. Is the admin group similar to the wheel group or is there also a wheel group for sudo access? And yes, I very seldom run scripts copied from somebody else so when I do, I make sure I know what is being run. Granted, I'm a Linux and Windows user so the OSX philosophy might be different.