BaYan is a tool for placing banner ads on Yandex.
Media-contextual banner — a Yandex advertising product combining the advantages of media and contextual advertising.
What are the advantages of contextual advertising?
What are the advantages of banner ads?
How do I place a banner ad?
In addition to media-contextual banners, you can use the traditional advertising format for Yandex.Direct — text ads which are served according to keywords and paid for per click.