Rank is the position when the table is sorted by the sales column. The title links to that game's Wikipedia article. Sales, in millions of copies, is the column the ranking uses. Series, platform, year, developer, and publisher are the context for that number.
Games with the same sales figure share a rank. The next game skips ahead by the size of the tie. The Elder Scrolls V: Skyrim and The Witcher 3 both sold 65 million, so both are rank 9, and Super Mario Bros. is rank 11. The same rule puts four games at rank 21 (40 million each) and gives Super Smash Bros. Ultimate rank 25.
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The sales figures, years, platforms, developers, and publishers were collected for the earlier class table from Wikipedia's list of best-selling video games. Each title in the data table still links to its own article. The pack-in note on Wii Sports follows the footnote on that list.
These pages keep the figures from that class dataset. Publishers revise lifetime totals, so a current visit to Wikipedia may show a higher number for the same game. The comparisons on this site use the numbers printed in the table.
The sales cell records copies. That is different from revenue, budget, review score, or the number of people who played a free version. Cover images on the data table are the box art and logos from the earlier assignment. They help a row be found visually. The sales figure, not the image, is the measurement.