Final answer:
Sitcoms focus on relationships, whether romantic or character-based and differ from jokes in that they revolve around situations and interactions between characters.
Step-by-step explanation:
In sitcoms, the focus is on relationships, which can be romantic or various character relationships. This differs from jokes because sitcoms are not solely based on one-liners or standalone humour. Sitcoms revolve around the situations characters find themselves in, deriving humour from these situations and the interactions between the characters. Jokes, on the other hand, are often short and punchy, centred on delivering a quick laugh.