Difference between HART Protocol and Foundation Fieldbus

What are the main Difference between HART Protocol and Foundation Fieldbus used in industrial instrumentation. More Fieldbus Articles - What is Foundation Fieldbus ? https://instrumentationtools.com/foundation-fieldbus/ Fieldbus Control https://instrumentationtools.com/fieldbus-control/ 4-20mA Versus Fieldbus https://instrumentationtools.com/how-will-a-field-jb-of-conventional-4-20ma-connection-look-different-from-that-of-ff-jb/ What is Fieldbus? https://instrumentationtools.com/what-is-a-fieldbus/ Fieldbus Network Topologies https://instrumentationtools.com/different-fieldbus-network-topologies/ Fieldbus vs Profibus vs HART