Facebook Open Graph Tags are a type of structured data that can be placed on your page to control what is shown when your page is shared on Facebook. You can indicate exactly what content should appear in a sharing snippet's title, description, imagery and other information. This is useful when pages like your homepage, products or articles are shared, and effective sharing can drive traffic and conversions. You may want to ensure that the content presented is correct and has the highest chance of attracting visitors. If you don't define specific content, Facebook may decide automatically which pieces of text and imagery are displayed which may not always be correct or appealing.
We recommend defining as many of Facebook's Open Graph fields as possible, and inserting this code into the HTML of your page. Facebook has a helper tool for creating this content, or sometimes it can be written automatically with the help of a CMS plugin.