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 2022 Q4 it was $11.56 billion, up by 19% year-over-year from $9.72 billion. From $31.16 billion in 2021 it increased by 21% to $37.74 billion in 2022.