OData \ REST

I am a bit lost in terms and ways to access SharePoint lists thru REST\OData. I found two different syntax:

1. /_api/web/Lists/getByTitle('ListName')/items?$top=5000

2. /_vti_bin/listdata.svc/ShortListName

Only 1st is REST? Where is it endpoint?

Do they both return the same OData xml? Well i checked and it is a bit different. What is the difference?

Why the parameters syntax like ?$top=5000 does not work in the second example?