404 template renders page content that is shown to customers if they enter an invalid URL for the store.
404 template is located in the
templates directory of the theme:
There are no suggested objects for a 404 template. However, the template should make it clear to the customer that the page they were looking for couldn’t be found.
You should provide obvious options for how to proceed. For example, you can add links to popular pages, a search bar to help customers find what they’re looking for, or a link that redirects customers to your home page or a collection to continue shopping: