Downtown in basketball is a term to describe the area beyond the 3-point arc. If a score is made from beyond the 3-point arc, an announcer might use this phrase. For example, if Steph Curry hit a long 3-pointer, the announcer might yell, "Curry, from downtown!"
If a player hits a shot from his own half of the court, the announcer probably will not refer to it as downtown. Rather, they will emphasize the distance and describe it as a half court or full court shot. These shots are very rare and usually only happen when the game clock is about to expire.
Shooting from deep downtown is a 3-point shot that is far away from the 3-point arc. This is a very long and difficult shot.
Remember that any shot from beyond the 3-point arc counts for 3 points, regardless of how far away the shooter is. With that said, why do some shooters choose to try shots from deep downtown?
A player might also choose to shoot a long shot if he is trying to intimidate his opponents. There is nothing more assertive than hitting a long 3-point shot with ease.