What is common and what are the differences between symbiosis and parasitism?

Symbiosis is the cohabitation of two living organisms, which is beneficial to both, and parasitism is the existence of one organism in another (or on the other), which is characterized by the fact that the parasitic creature feeds on the host, while harming it.
An example of symbiosis is hermit crab and anemones. Their union is mutually beneficial: the anemones get the ability to move, and the hermit crab gets a protector in the person of anemones.
Parasites are considered: those for which the host’s body is a habitat and those who use the host’s body as a source of food.