Prescription-only medication (POM)
Refers to medication that only a highly-qualified medical professional, such as a doctor or pharmacist, can prescribe.
Doctors can also e-prescribe, which is more commonly practiced today.
Example: All hormonal birth control
Over the counter medication (OTC)
Refers to medication you can easily buy in a pharmacy as an ordinary retail purchase, no prescription or license is required.
Example: Condoms