「ご飯」 (gohan) has two main meanings: "cooked rice" and "meal" in general. It's a very common word in Japanese daily life. You use it to ask 「ご飯を食べますか？」 (Will you eat a meal?) or refer to the staple food, rice.

炊いたお米のこと、また食事全般を指します。日本の主食です。