Why do I need a Facebook pixel ID?

The Facebook Custom Audience Pixel enables you to enjoy all the benefits of conversion tracking, optimization and remarketing. With it, you can get the following insights on Facebook and Instagram:

• Measure cross-device conversions: See how your customers are moving between devices before they convert.
• Optimize delivery to the people most likely to react: Ensure your ads are being seen by people most likely to take a desired action, such as making a purchase or filling out a form.
• Automatically build audiences for website visitors to retarget: Create custom audiences for people who have taken specific actions on your website, such as visited a product page, added to cart or purchased a product.
• Create lookalike audiences: Find more people who are similar to your best customers.
• Run dynamic product ads: Create relevant and timely ads on Facebook based on the products people have visited on your website.
• Access audience insights: Get deep insights into your website visitors