what is cors in angular code example

Example 1: angular cors issue

header('Access-Control-Allow-Origin: *');

Example 2: adding cors in angular

"architect": {
    "serve": {
            "builder": "@angular-devkit/build-angular:dev-server",
            "options": {
                "browserTarget": "project-name:build",
                "proxyConfig": "src/proxy.conf.json"
            },
          }
}