There are 11 types of seams which include: abutted, enclosed, exposed, false french, flat-felled, french, fused, glued, hairline, lapped seam with raw edges, and finally overedged seam.

The three types of seam are Plain seam, French seam and Ancient or Old German flat seam.

An enclosed seam, or a French seam, is a seam that is sewn with the wrong sides of the fabric together. A second seam is usually sewn with the right sides together so that the first seam is enclosed.

To make a French seam you sew your seam right sides together. at 5/8th in.... Then you trim away half of one side of the seam.... Then you press the seam towards the shorter half. Then you fold the longer half over the narrower half and press..... then you stitch up the flat open side..... that makes a double sewn seam called Frenched seaming.

Where you overlap the edges approximately 1/4 of an inch.