We are mentioning some types of watches below for not specifying an exact number.
By Movement
-Quartz - Battery powered. The most common type of movement. It requires battery change if it runs out of power.
-Mechanical - Movement that use mechanical parts and have zero reliance on battery. There are two kinds of mechanical movement : Manual and automatic. In today’s term, people simply use the word ‘mechanical’ to refer to manual movement. Manual movement gains power by having the crown being wounded.
-Automatic - Mechanical movement that gains power through the motion of the wearer (or simply by just shaking it). Some automatic watches also feature the traditional manual style of gaining power through winding the crown called “manual wind”.
-Kinetic - Quartz movement that can gain power through the motion of the wearer. Unlike automatic, kinetic is still quartz, so it uses battery.
-Solar - Quartz movement that can gain power through solar energy.
By Style
-Dive watch - Like its name, they are made to survive underwater. Dive watches often feature screw down crown, in which the crown requires screwing (with fingers) to lock/unlock, ensuring better protection against water. Dive watches also have thicker rubber gasket inside than the other types of watches to improve water resistance. Some dive watches feature a rotating bezel, which can be used as a timer. Dive watch is often the favorite type of watch among enthusiasts due to its water resistance (which ensures longevity of life from dust and pressure) and the rotating bezel comes in many varieties of design.
-Pilot watch - Watches that take their roots from aviation history. Proper pilot watches should be easy to read, as they were developed for pilot fighters who were in need to read the time quickly. They often have large sizes (to make it easy to read), but smaller ones also exist. WW2-style pilot watches are called flieger.
-Field Watch - Watches with military-army style. Majority have thick hands to make it quick to read.
-Dress watch - The definition of dress watch is very subjective. Today most people refer dress watches as watches with simple and elegant design that can be worn with suit appropriately for formal occasions. However, in the earlier days, many dive watches and field watches almost looked the same as dress watches, so the term might not apply to older watches. Proper dress watches must be slim enough to hide beneath the sleeve of the shirt/suit.
-Moon watch - Moon watches are supposedly able to survive on the moon.
-Chronograph watch- Although chronograph itself is a feature rather than a type of watch, it is sometimes referred as a type of its own. Chronograph works like a timer, where traditionally there are two buttons surrounding the main crown; one for reset and the other one for start and stop. Chronographs can also be found in pilot watches, field watches, and usually in moon watches, but chronograph watches that don’t belong in any type is simply called “chronograph watches”.
-Moonphase watch - Like chronograph, moonphase is also a feature and watches with moonphase are called moonphase watches. Moonphase indicates the phase of the moon, which follows the calendar of the watch. When it’s day, the moonphase indicates the sun, while entering the night, it transits into moon. The picture of the moon varies depending on the phase of the moon. If the moon is eclipse, then the picture displays eclipse moon.
-Day and night watch - They are basically like moonphase watches, but don’t display the phase of the moon, but rather just day and night.
By Display
-Analog - The most traditional display style. It consists of an hour hand (arrow pointing at the hour time) and a minute hand (arrow pointing at the minute time). Most analog watches also have second hand (arrow pointing at the second time).
-Digital - Digital uses LCD screen to display information. Digital watches can only be found among quartz (including kinetic and solar) because it requires electric power.
-Analog & digital - Combines both digital and analog. It can only be found in quartz because the LCD screen requires electric power.
By class
-Entry level - Some say they cost bellow $1,000, others say they cost bellow $600.
-Mid level - Some say they cost around $1,000–9,000, others say they cost around $600–1,000. Sapphire crystal is necessary at this price range. Above $2,000, original design and heritage are very important.
-Luxury - Some say they cost around $10,000 an above, others say they cost around $1,000 and above.