React is a single page application which means all web pages are served from the same location(index.html). A standard html site would have a separate index file for each page that would be served by the server. Since this isn’t the case for React, you need to create a _redirects in order to get your routes working.

The _redirects file is a file that tells Netlify where it should redirect the clients based on the address or route that they are attempting to request. Our React router takes care of all the routing so all we need to do is have Netlify redirect any request to index.html.

/*    /index.html   200