The following are the main parts of a watch:
Watch Case – the body that houses and protects the watch movement from dust, dirt, moisture and shocks.  It also gives the watch as attractive appearance as possible, subject to fashion and to the person’s taste.

Crystal – the transparent protective covering over a watchc face, made of sapphire, mineral crystal, glass or plastic.

Dial – the readable part of the watch, the face:

Analog display – the system of indicating time using hands and a dial.

Numerical display – the system of indicating time figures.  Also called a Digital Display.

Anadigi display – a display that shows the time both by means of hour and minute hands (analog display) and by numbers (digital display).

LCD (Liquid Crystal Display) – a method of displaying time in an electronic watch.  It is created when particles are rearranged by electrical excitation.  In LCD watches time is displayed constantly.  All LCD watches have quartz movements.

LED (Light Emitting Diode) – the method of displaying time and/or other functions in an electronic watch using the phenomenon known as electroluminescence.  The time appears on the watch face of an LED watch only when a button is pressed and power is sent to the diodes.

Guilloche – a type of engraving in which thin lines are interwoven, creating a patterned surface.  Adds beauty and design to the watch.

Subdial – a small dial on a watch face used for any of several purposes, such as keeping track of elapsed minutes on a chronograph or indicating the date.

Hands – indicated the time or function.

Crown – the knob used to set hands and change functions.

Stem – the shaft connecting the crown to the winding and setting mechanism.

Push button – used in complications to start and stop special functions.

Watch strap – leather, rubber, fabric or synthetic materials.

Deployant buckle – safety feature protects against dropping the watch.  Allows for the look of a strap style with the convenience of a one-piece foldover buckle style band.

Watch band – either a link or expansion band made in stainless steel, gold or combination of materials.

Integrated – watch and bracelet in all one piece to accent a particular design.

Bezel – case ring that holds the crystal, sometimes set with precious stones.