Row-major order is a way of organizing data in a table or grid. In row-major order, the data is read by going through each row one at a time, and each row is read from left to right. So if you had a table with 5 rows and 3 columns, row-major order would mean that you would read the first row from left to right, then the second row from left to right, and so on until you read the last row from left to right.