Is gel pen also called water-based pen? It's the kind of pen that everyone is using recently. What should it be called?

Ink pen is a common name for gel pen. The reason for taking this name is that the ink of gel pen is not the oily component of ballpoint pen, but the neutral ink stored between colloid and liquid in the refill, which flows out through the nib when writing, and the effect is similar to ink, so some people call it water pen. Another kind of water-based pen, different from gel pen, is a direct liquid signature pen. It uses water-based ink instead of gel pen, which has a strong penetration effect when writing and presents heavy handwriting, so it is usually called a signature pen.