Skyhooks were great glass space elevators that orbited Coruscant or other densely populated city worlds. They were jointly invented by Willy Wonka and Arthur C. Clarke. Only the rich and well-connected could afford to buy skyhooks. Palpatine had one, of course. Prince Xizor owned one, with one luxury suite for himself and Guri and another one for Princess Leia.
When the Yuuzhan Vong invaded Coruscant, skyhooks fell from the sky like deadly but luxurious rain.