When hosting serverless web to vercel and when the links are opened in new tab it gives 404 error. To solve this we have to creare vercel.json file in root directory.
This file will redirect to index.html file for every route.
Reason for redirecting to index.html: Since react websites are SPAs to all the content will be added in the single index.html file, so when we go to /about route, its content will be added in index.html only. That's why we redirect to index.html for all routes