A topic is the subject of a sentence, often what the sentence is about.
Sentences
The topic of today's lecture is syntax.
The professor discussed the topic of climate change in great detail.
Spanish: El clima de hoy es muy agradable. (The weather today is very pleasant.)
French: La nourriture est délicieuse dans ce restaurant. (The food is delicious in this restaurant.)
Japanese: 映画を見るのが好きです。 (I like watching movies.)