HOW CAN I CONNECT MY LOCAL DATA BASE TO WIX WEBSITE DATA BASE, WHAT ALL THINGS I NEED , I AM USING WINDOWS 10 MACHINE AND MYSQL

To call a local database from a wix site use Wix Fetch from either the page itself or public folder. Something like this:

export function employer(json_payload) {
 return fetch("http://localhost:5000/endpoint", {
    method: 'post',
    headers: {
       'Content-Type': 'application/json'
    },
    body: JSON.stringify(json_payload)
    })
    .then(response => response.json())
    .then( (json) => {
         if(json.error) {
                let callback = {
                    status: 400,
                    response: json.error
                }
                return callback;
        } else {
                return json;
        }
    });
}

And please do not post in all capslock. See the community guidelines

I am new to Wix and its forum , can you also help me with how to define Endpoint

You will need to read about how to access 3rd party services in the article Corvid: How to Access 3rd-Party Services with the Fetch API .

A nice simple example to start with is Create a Weather Widget . Also, t ake a look at the Advanced examples , many of them access 3rd party services. A couple of good examples to start with are: Example: Using the Places API from Google Maps services and Example: Send email with the SendGrid REST interface .

You might also want to consider using the External Database feature.