As with all social media platforms, posting or in Twitters case Tweets are used to keep your audience engaged, with Business this can also be used to, update them on upcoming event, specials or news and grow your company’s brand awareness.
Promoted Ads are paid listings that businesses use to reach a wider group of users or spark engagement from their existing followers.
All Promoted Ads are clearly labeled as "Promoted" when they appear in your feed, profile etc. However, Promoted Ads are just like regular Tweets and can be Retweeted, replied to, liked, and more.