Explanation:

Direct marketing consists of any marketing that relies on direct communication or distribution to individual consumers, rather than through a third party such as mass media. Mail, email, social media, and texting campaigns are among the delivery systems used. It is called direct marketing because it generally eliminates the middleman, such as advertising media.
Unlike traditional public relations campaigns pushed out through a third party such as media publications or mass media, direct marketing campaigns operate independently to directly communicate with target audiences. In direct marketing, companies deliver their messaging and sales pitches by social media, email, mail, or phone/SMS campaigns. Although the number of communications sent can be massive, direct marketing often attempts to personalize the message by inserting the recipient's name or city in a prominent place to increase engagement.