2 websites in same wordpress

This is possible with a multisite installation. See: https://kinsta.com/blog/wordpress-multisite/

However, setting this up retrospectively is risky. I would recommend testing this in a staging system first before you do it in the live system.

Multisite does indeed make multiple sites in one installation possible, but for the most part management is still done separately site by site, there’s little that can be done network wide. Using multisite does introduce some (IMO) less than desirable quirks. Personally, if my multisite would be limited to only two sites I would personally just make two single site installations on my server to avoid those quirks. If more than three sites are anticipated then multisite is the way to go.

Of course there could be unique reasons why multisite would be desirable for even only two sites, but generally speaking I’d avoid it.

There is multisite, as others have mentioned.

Thinking of it like a “network” makes it easier to understand. If the site is another travel blog you want to be “networked” with the original travel blog, or you plan on making more travel blogs within the same network, …multisite network starts to make a lot of sense.

Although for technical reasons, as long as they share a lot of plugins…that could be considered enough relation for multisite to make sense. Instead of updating the same plugins across multiple separate sites, you just need to update the plugins on one multsite instance. It can make maintenance more straightforward.

If they’re completely unrelated sites, I’d keep them as separate standalone WordPress installs. Plenty of WordPress hosting services let you keep multiple separate installs under the same account / server.