EHR stands for Electronic Health Record, which is a digital version of a patient's medical history that is stored and managed by healthcare providers. EHRs contain information about a patient's medical conditions, treatments, medications, allergies, laboratory and imaging results, and other relevant health information.

There are three main types of EHR systems:

Standalone EHR: This type of EHR system is designed to function on its own without any other healthcare software. It is typically used by smaller practices that do not need to integrate with other systems. An example of a standalone EHR system is Practice Fusion.

Client-Server EHR: This type of EHR system is installed on a local server and accessed through a client application installed on individual computers. It is typically used by mid-sized practices that require more functionality and customizability. An example of a client-server EHR system is Epic.

Web-based EHR: This type of EHR system is accessed through a web browser and does not require any installation. It is typically used by larger practices and healthcare organizations that need to access the system from multiple locations. An example of a web-based EHR system is Cerner.

Overall, EHR systems are designed to improve patient care by providing healthcare providers with quick and easy access to a patient's medical history, which can help them make more informed decisions and provide better care.