Simplify the following text for a Grade 7 native English-speaking person.
Original: A matrix with one row ( a 1 Ã -- n matrix ) is called a row vector , and a matrix with one column ( an m Ã -- 1 matrix ) is called a column vector . Any row or column of a matrix determines a row or column vector , obtained by removing all other rows or columns respectively from the matrix .
Simplified: A matrix , that has many rows , but only one column , is called a column vector .