In biology, matrix (plural: matrices) is the material between animal or plant cells, the material (or tissue) in which more specialized structures are embedded, and a specific part of the mitochondrion that is the site of oxidation of organic molecules. The internal structure of connective tissues is an extracellular matrix. Finger nails and toenails grow from matrices.
The molecules forming the "glue" between cells in connective tissues are summarily referred to as the extracellular matrix.
Tissues and cells
Bioinformatics and sequence evolution
Botany and agriculture
Population biology and ecology