Here's a breakdown:

* Xylem is a type of vascular tissue responsible for transporting water and dissolved minerals upwards from the roots to the rest of the plant.

* Wood is primarily made up of xylem cells, which are dead at maturity. Their thickened cell walls provide structural support for the tree.

* Cambium is a layer of actively dividing cells located between the xylem and phloem. It produces new xylem cells (wood) on the inside and new phloem cells on the outside, contributing to the tree's growth in diameter.

So, while the xylem is the primary tissue forming wood, the cambium plays a vital role in its production.