Amazon defines this as:
Includes sales of advertising services to sellers, vendors, publishers, authors, and others, through programs such as sponsored ads, display, and video advertising.
Last reported quarter 2023 Q4 it was $14.65 billion, up by 27% year-over-year from $11.56 billion. From $37.74 billion in 2022 it increased by 24% to $46.91 billion in 2023.