Disparate systems are types of computer systems that are not connected to each other. They are independent from each other, and don't share information. This means that the data stored in one system will not be accessible to the other. Disparate systems can be used to keep different sets of information separate, like in a hospital, a doctor's office, and a pharmacy, each might have its own computers that don't share any data. This can help keep the information secure and private.