Tissue is a body substance made from many of the same type of cell. Muscle cells make muscle tissue, nerve cells form nerve tissue, and so on.
As well as cells, some tissues include other materials.
Connective tissues are made from particular cells (such as fibroblasts), plus two other materials – long fibers of protein (such as collagen) and a matrix. Matrix is a material in which the cells and fibers are set like the currants in a bun.
Connective tissue holds all the other kinds of tissue together in various ways. The adipose tissue that makes fat, tendons and cartilage is connective tissue.
Bone and blood are both connective tissues.
Epithelial tissue is good lining or covering material, making skin and other parts of the body.
Epithelial tissue may combine three kinds of cell to make a thin waterproof layer – squamous (flat), cuboid (box-like) and columnar (pillar-like) cells.
Nerve tissue is made mostly from neurons (nerve cells), plus the Schwann cells that coat them.
Organs are made from combinations of tissues. The heart is made mostly of muscle tissue, but also includes epithelial and connective.