DirecTV, the No. 1 U.S. satellite TV operator, said on Sunday it has agreed to sell itself to AT&T for $48.5 billion in the second mega-deal to shake up the U.S. television landscape this year.

Here's a look at both companies, with a focus on which of their services may be combined in the deal.

AT&T

DirecTV

(Reporting by Liana B. Baker and Marina Lopes; Editing by Eric Walsh)