Embroidery can be classified into many different types, but the most common classification is based on the technique used. Here are six main types of embroidery based on technique:

Crewel embroidery: This type of embroidery is worked with wool thread on a plain weave fabric, and is typically done in a free-style manner.

Cross-stitch embroidery: This type of embroidery is worked on an evenweave fabric, where the stitches form an X-shape. It is commonly used for counted-thread designs.

Canvas work embroidery: This type of embroidery is worked on a closely woven fabric, and the stitches are made to cover the entire surface of the fabric, creating a dense and textured design.

Whitework embroidery: This type of embroidery is worked on white or cream-colored fabric using white thread. The designs are often delicate and intricate, and can include cutwork, drawnwork, and pulled-thread techniques.

Blackwork embroidery: This type of embroidery is worked in black thread on a white or off-white fabric. The designs are usually geometric and repetitive, and the contrast between the black thread and the light-colored fabric creates a striking effect.

Goldwork embroidery: This type of embroidery uses metallic threads, wires, and beads to create designs that are often opulent and luxurious. Goldwork embroidery has been used for centuries to embellish clothing and other decorative items.