If something is suggested, it means that someone has mentioned it as a possible thing to do or have.
When something is suggested, it is like a little idea that someone gives you to think about.
Examples:
She suggested going to the park.
He suggested a game to play.
The teacher suggested a new book to read.
My friend suggested eating ice cream for dinner!
The doctor suggested that I should eat more vegetables.
He suggested a funny joke to tell.