If you're riding a splitboard in the backcountry, you need splitboard-specific bindings—regular bindings won't work. Splitboard bindings are designed to detach and convert between ride mode and tour mode, with built-in heel lifters that let you walk uphill efficiently. Without this touring functionality, you can't ascend on a splitboard.
These bindings use pucks or pin systems that let you slide them off for climbing and reattach for the descent. The trade-off is added weight compared to standard bindings, and the ride feel can be slightly different since you're standing on a touring interface rather than a solid base. That said, modern splitboard bindings have improved dramatically, and most riders find the downhill performance perfectly acceptable.
One common mistake: don't buy splitboard bindings if you only ride at the resort. You'd be carrying unnecessary weight with zero benefit. They're purpose-built for backcountry access.