Sperm motility is a term used to describe the movement and forward progression of sperm. There are several synonyms that can be used in place of sperm motility, including sperm mobility, sperm velocity, sperm movement, and sperm swimming ability. These terms all refer to the same characteristic of male reproductive cells, and are used interchangeably in scientific and medical research. Sperm motility is an important factor in male fertility, as it affects the ability of sperm to fertilize an egg. Researchers study sperm motility to better understand male infertility, and to develop treatments and therapies to improve male reproductive health.