Dinner is ready. Please come and eat.

Meaning: This means that your evening meal is prepared and ready to be eaten. It's a polite way of inviting someone to join you for dinner.

Choice of Words: Dinner is a noun that refers to the main meal of the day, typically eaten in the evening. Ready means that something is prepared and available to use. Please is a polite word used to make a request. Come is a verb that means to move towards a place. Eat is a verb that means to consume food. When you put them together, "Dinner is ready. Please come and eat." is a polite and informative way of asking someone to join you for dinner.