Etching and engraving are different though closely related prints/printing techniques. They are both members of the intaglio class of printing, and the techniques are centuries old.

If you look at the typical engraving and typical etching placed side be side, it’s easy to identify which one is which. The typical engraving has conservative, stoic, conservative lines like in the portraits on US paper currency. The typical etching will look like a pen and ink sketch, with spontaneous line as if hand drawn.