Final answer:
Spermatids become mature spermatozoa through a process called spermiogenesis, which is followed by sperm maturation in the epididymis.
Step-by-step explanation:
The processes where spermatids become mature spermatozoa are collectively referred to as spermiogenesis and sperm maturation. Spermiogenesis is the process during spermatogenesis that transforms spermatids into spermatozoa. This involves morphological and structural changes such as the growth of a tail, reduction of cytoplasm, and formation of the acrosome and flagellum. After spermiogenesis, the immature sperm move into the epididymis for sperm maturation, where they gain the ability to move and fertilize an egg. This includes the development of the ability to swim and further condensation of the genetic material in the nucleus. The entire process from spermatid to mature sperm takes place within the seminiferous tubules of the testes and the epididymis, and is hormonally regulated, mainly by testosterone and follicle-stimulating hormone (FSH).