A table is a grid into which you type text in the individual cells at the intersection of each Column and Row. Using Table in PowerPoint helps you to display detailed numerical data in an easy-to-read format.

When a table is selected you can see Table design and Layout (two tabs)

The layout is where you add or delete columns.

Add a row or column

1. Select where you want to add a row or column by clicking a cell adjacent to the location in the table.

2. Click the Layout tab on the right side of the Ribbon ( next to the Table Design tab on the ribbon).

3. Now for adding rows , Click Insert Above or Insert Below and for adding Columns Click Insert Left or Insert Right.

4. The new Row and Column Added.