Tables are composed of rows and columns. They are used to display data. Remember that:
The table tag creates a table. Rows are defined using the tr tag and columns are defined using the td tag.
The following table is composed of four rows and three columns:
| 1 | 2 | 3 |
| 2 | x | x |
| 3 | x | x |
| 4 | x | x |
The following table is composed of two rows and four columns:
| 1 | 2 | 3 | 4 |
| 2 | x | x | x |
tr is short for Table Row.
td is short for Table Data.