HVLP means High Volume Low Pressure. It’s a more efficient way of spraying. More media (paint) gets deposited than the old style sprayers. The difference is the air. It’s not run with a high pressure compressor (like you use for filling up your tires) but a low-pressure blower making a large volume of air (essentially a reversed vacuum motor). Works fine, it’s portable, and inexpensive. You can get a generic HVLP sprayer for $99, but some places are selling them for $79. I wouldn’t paint a house with it, but for small furniture projects, it works great.