Magento Open Source 2.1.x

URL Rewrites

The URL Rewrite tool lets you change any URL that is associated with a product, categoryA set of products that share particular characteristics or attributes., or CMS page. When the rewrite goes into effect, any links that point to the previous URL are redirected to the new address.

The terms rewrite and redirect are often used interchangeably, but refer to slightly different processes. A URL rewrite changes the way a URL appears in the browser. A URL redirect, on the other hand, updates the URL that is stored on the server. A URL redirect can be either temporary or permanent. Your store uses URL rewrites and redirects to make it easy for you to change the URL key of a product, category, or page and preserve existing links.

By default, automatic URL redirects are enabled for your store. The "Create Permanent Redirect for old URL" checkbox is marked under the URL key field of each product.

Create Permanent Redirect for Old URL