"A talk" is an event where an author, a researcher, an expert, or some other person speaks to a large audience.

It's similar to a "speech", but a speech is more associated with politics, debating issues, or formal ceremonies. A "talk" is for explaining interesting ideas to people.

You "see" a talk or other performance. Some other things that you can "see" include:

• see a dance performance
• see a play
• see a concert

On the other hand, for TV and movies it's more common to say that you "watch a movie" or "watch TV".