Introduction
Matrices
A matrix is a rectangular array or arrangement of entries or elements displayed in rows and columns put within a square bracket [ ].
Matrices are denoted by capital letters etc.
General form of a matrix
If a matrix has rows and columns, then it is written as
Example of matrices

In a matrix, the horizontal lines of elements are known as rows and the vertical lines of elements are known as columns.
Above matrix has rows and columns, has rows and columns.