If you ever need to embed a website within a website its possible using iframe code. This is similar to embedding videos to pages. Usually Youtube and social media provide their own embedding code.

Just paste the code into the text editor of your WordPress page, update the link and change your width and height to match the page settings. Then your good to go.

*Note: The code only works if the page is using the same protocol as the one its linking to. For example a Https page has to link to a Https page. If it goes to Http the link will break.