a. What is the usage of Catalog?
Answer: Any collection (category) added will show under Catalog. It helps to display all the collections in your store.
b. Can I remove the Catalog?
Answer: You could not remove it, but you may rename it to your preferable name (e.x All products).
1. EasyStore Control Panel > Content > Click Edit beside Catalog
2. Change the name as your preferred > Save page