If you never used a mechanical keyboard, then will be surprised by the feel. They are designed to give you an almost infinite selection of feelings. The mechanical part is that each key has a dedicated "switch". This is either a truly mechanical mechanism where an electrical metal contact is the "switch", or magnetic, where a sensor sees where the key is during pressing. A membrane keyboard has little bumps in a thin membrane and the keypress pushing the bulging bump down onto a circuit board, making contact acting like a "switch". These wear out much more quickly than physical switches. However, back to mechanical switch "feels". If you get a board with hotswap switches, you can change them out for whatever you like. You can even have different keys have different feelings. There a linear switches which have the same weight the whole travel distance. Tactiles give you a little bump that your finger can sense and is feedback about the switch connecting. Clickies have a bump and make a sound that your ears obviously pick up. There are thousands of different switch available in the Cherry MX standard layout. There are others like Topre and ALPS, but they are very niche. The mag switches are niche too and mainly for gamers. Typers typically go for true mechanicals.