This is an extremely basic question but also one I can't really seem to find an answer for, despite looking through the nmap documentation (man, online, and google).
My question is, what is the difference between doing
nmap <target> and
nmap -sS <target>, for example? I know that
-sS is a TCP SYN scan, but I guess what I am not sure of is how/why this differs from just scanning ports using