Facebook advertising reaches the desired target audience by utilizing extensive user data and algorithms. Companies can optimize their ads based on interests, demographic characteristics, and user behavior, creating a detailed profile of users through analyzing activities, likes, and comments. With this information, the social network can present relevant ads to users who are most likely interested in the advertised products or services. Additionally, Facebook allows the use of Lookalike Audiences, identifying similar user groups that resemble existing customers, expanding the reach and targeting potential new customers.