What does freedom of movement in the EU mean?

Free movement of workers is a fundamental principle of the EU. Citizens of EU member states can look for a job in another EU country, work there without needing a work permit, reside there for work purposes, stay even after employment has finished and enjoy equal treatment with nationals in access to employment, working conditions and all other social and tax advantages. Free movement rights may differ for self-employed people, students, and retired or otherwise economically inactive people. Member states can also deny entry on security grounds. Free movement of workers also applies, in general terms, to the countries in the European Economic Area: Iceland, Liechtenstein and Norway.