Let's Barter

There's a product called Let's Barter that apparently wants me to trade stuff instead of buying it, but here's the thing: I have literally no idea what this actually does or how it works. The description is literally just the tagline repeated, which is not giving me much to work with here. You're going to need to actually tell me how the trading works, what the interface looks like, and why I'd choose this over Venmo before I can decide if this is the move or just another vague idea.