Without changing of your website core you can easily install or set up new functionality using with WordPress Plugin.
WordPress Default Plugin : When you install or setup WordPress website there is a two default plugins install in it.
- Akismet: Akismet checks your comments against the Akismet web service to see if they look like spam or not. You can review the spam it catches under “Manage” and it automatically deletes old spam after 15 days.
- Hello Dolly : This is not just a plugin, it symbolizes the hope and enthusiasm of an entire generation summed up in two words sung most famously by Louis Armstrong. Hello, Dolly. This is, by the way, the world’s first official WordPress Plugin.