There are 2 types of WordPress you can decide to go for. And this 2 types of WordPress comes from how they are being hosted.
With WordPress.org, You have to worry about getting your own hosting as YOU host your own website. WordPress.org is where you’ll find the free WordPress software that you can download and install on your own web server.
On the other hand, WordPress.com takes care of all of the hosting for you. You don’t have to download software, pay for hosting, or manage a web server.
Both WordPress.org and WordPress.com have pros and cons, depending on your needs.