what are caecum,colon and rectum

Caecum is a pouch like structure and is a part of large intestine, it is found where the ileum of small intestine meets with large intestine. It is mainly used in the digestion of plant based food.

Colon is a part of small intestine where most of the water and salts are absorbed.

Rectum receives waste material from colon and  stores it till the time it is not passed out.