The whitish liquid secreted by the sexual glands is the semen. Moreover, It has sperm, which is the male reproductive cell. That’s the actual difference between semen & the sperm, but they are both crucial parts of your reproductive system.
Moreover, The volume of semen & the characteristics protects spermatozoa on their way to egg. The healthy sperm cells are mobile & reach the egg in a quick succession. Healthy sperm should have a mix of elements that come from the testes. Others of them come from the prostate gland or depend on the vesicles of seminal. Combined them together they give the ejaculate a certain color & even the thickness we can evaluate in a plain sight. If we are interested in health of the sperm, we should put some kind of sample under the microscope.