1. A subject matter or theme that is fundamentally important, necessary, or crucial to understand or discuss
Climate change is an essential topic in modern education.
Mudanças climáticas são um tópico essencial na educação moderna.
2. A core concept or key subject that forms the foundation of a field of study or discourse
Data privacy has become an essential topic in technology and business.
Privacidade de dados tornou-se um tópico essencial em tecnologia e negócios.