Basically, it's exactly what it says on the tin (sometimes literally, if your logo is in fact stamped onto metal containers). For best results, an experienced graphic designer will be needed to either update your existing corporate identity or to carve you something new from the amorphous ideas locked inside your brain. Typically something as important as this requires a lot of conversation with you the client, to perfectly encapsulate and project the intended goal and vision of your business. Let's be honest, a ton of money and future opportunities will rest on nailing this one single visual element. No pressure at all.