What are the similarities between active and passive transport?

There are various similarities between active and passive transport. They both allow for the entry and exit of ions and molecules in a cell. Both allow for only specific substances to pass through the cell membrane. They also both play a role in the homeostatic regulation of cells since substances are moved in and out of the cell. Active and passive transport both require a concentration gradient of the substance in order for molecules to be transported. Lastly, both active and transport use ion channels for their processes.