What does "advertising agency" mean?

a business enterprise dedicated to creating, planning and handling advertising on behalf of its client companies.

Advertising agency

Common synonyms include: ad agency, advertising company, advertising firm, advertising partner, agency partner, campaign partner.

noun

noun ·Rare ·Advanced level

Noun

1
a business enterprise dedicated to creating, planning and handling advertising on behalf of its client companies.
2
an agency that designs advertisement to call public attention to its clients wordnet