"Hosted by" is used when someone or something is the organizer or provider of an event. For example:
* "The party was hosted by Sarah."
* "The conference is hosted by the University of California."
"Given by" is used when someone or something is the source of something, like a gift or a speech. For example:
* "The award was given by the mayor."
* "The speech was given by the CEO."
Here's a simple way to remember the difference:
* Hosted by focuses on organizing an event.
* Given by focuses on providing something.
Example:
Imagine a conference. You could say:
* "The conference was hosted by the American Medical Association." (The AMA organized the conference.)
* "The keynote speech was given by Dr. Smith." (Dr. Smith provided the speech.)