The business or practice of creating and spreading paid messages to promote products or services; also the present participle of advertize.
From advertise with the 'z' variant plus the gerund/present participle suffix -ing. Historically common in American English before 's' spelling became standardized in the 20th century.
The advertising industry exploded in the 20th century and fundamentally changed how we think about everything—it's not just about selling products, it's about shaping desires and identities through images and stories.
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