What Does “This Section is Unreserved General Admission” Mean?

I’m looking to get tickets to game 1 vs. the Oilers on Monday and saw this when I click on many seats on Ticketmaster. What does “This section is unreserved general admission” mean?

I’m assuming once I buy the tickets, I’d get two seats together and I’d actually get assigned seat numbers and not just “show up and pick your seat in this section” right? I just can’t specifically pick which seats I want and won’t know until I buy them whether I get for example seats 1 and 2 or like seats 4 and 5 right?