Having a Facebook page and creating a website are two different things.
A Facebook page is a dedicated page on Facebook for your brand, product, service, or organization, where you can connect with fans, share content, provide updates, and interact with them.
On the other hand, a website is an online platform that belongs to you and is used to display detailed information about your brand, product, service, or organization, as well as provide detailed information about your business, such as contact information, service offerings, product catalog, etc. A website usually has its own domain name and can be found through search engines.
Therefore, if you want to provide detailed information to your customers or fans, or want your brand, product, service, or organization to have a wider online presence, then creating a website is a good choice. However, if you just want to interact with fans on Facebook, a Facebook page may be sufficient.