Which countries don't require visas for work?

Visa requirements for work vary significantly by country and depend on various factors, including nationality and the nature of the work. Generally, countries within the European Union (EU) allow free movement for EU citizens, enabling them to work without a visa. Similarly, countries like Canada and Australia have specific agreements that allow work without a visa for citizens of certain countries under specific conditions. It's important to check the specific regulations for each country, as they can change frequently.