Sales velocity and sales volume are related but distinct sales metrics. Sales volume refers to the total number of units sold over a given period. While increasing sales volume can potentially boost revenue, it might not necessarily lead to increased sales velocity if the sales cycle lengthens or the win rate decreases. On the other hand, improving sales velocity means you're not only selling more (volume) but doing so more efficiently – closing deals faster and winning more often, which can lead to sustainable revenue growth over time.