CLIL (Content and Language Integrated Learning) is an educational approach that teaches additional language skills through non-language subjects. It began in the 1990s due to increasing globalization. There are many forms of CLIL including language showers, camps, student exchanges, and total immersion programs. Effective CLIL strategies include integrating language learning into content classes and using content from subjects in language classes to achieve both content and language goals while also developing learning skills.