Facebook uses the information you provide in your profile, such as your age, gender, location, and interests, to target ads that are relevant to you.

2. Your activity on Facebook:

Facebook tracks the pages you like, the groups you join, the links you click, and the posts you share to build a profile of your interests.

3. Your interactions with ads:

Facebook pays attention to the ads you click on and the ones you ignore, which helps them learn more about your interests.

4. Your friends' activity:

Facebook also looks at the activity of your friends to see what ads they're clicking on and interacting with.

5. Third-party data:

Facebook also partners with third-party data providers to supplement the information it collects from you. These providers can provide information such as your income, buying habits, and credit score.

Based on all of this data, Facebook creates a profile of your interests and targets you with ads that are relevant to you.