# If a matrix has lots of values in a column but, not in row than, what that actually called?

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$\begin{bmatrix}a & b & c & d\end{bmatrix}$

$\begin{bmatrix}a \\ b \\ c \\ d \end{bmatrix}$

Which one is $1$ dimensional Matrix? I think that first matrix is $1$ dimensional. But, when we put $2$ values in row and two values in column. Then, we call that $2$ dimensional Matrix. So, what's the dimension of second matrix? It has lots of values in column and, only $1$ in every row.

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