French seams are a type of enclosed seam that is used to finish the raw edges of fabric. They are often used in garments, as they create a neat and professional-looking finish. French seams are also very durable, as they are enclosed on both sides.
To sew a French seam, you will need to fold the fabric over twice, with the wrong sides together. The first fold should be about 1/4 inch, and the second fold should be about 1/2 inch. Once you have folded the fabric, you will need to stitch it down close to the edge of the first fold. Then, you will need to fold the fabric over again, with the right sides together, and stitch it down close to the edge of the second fold. This will enclose the raw edges of the fabric and create a French seam.