When waste first reaches the large intestine, it dumps into it like sludge from a chute. The sludge solidifies as it travels through the large intestine. If all is well, the waste is in solid form (but not too solid) when it reaches the rectum.
The large intestine is the same thing as the large bowel. The main components of the large intestine include the cecum, appendix, colon, rectum, anal canal, and anus.