A matrix is a rectangular arrangement of numbers organized into rows and columns.

Example of a matrix:
[ 2 4 ]
[ 1 3 ]

Key terms:

• Rows go left to right

• Columns go top to bottom

• The order of a matrix is written as rows × columns

Example:
A 2 × 2 matrix has 2 rows and 2 columns

Matrices are used to organize data, solve systems of equations, and perform transformations.