English is the language of international communication in many areas of life: trade, air and sea transport, tourism, sport and entertainment. More and more people also need English for studying at the universities and colleges. New ideas in science, technology and medicine happen so quickly that it is impossible ( and very expensive) to translate everything into different languages. So most things are published in English, and if you want to keep up with the latest ideas in any subject, you need English.
Millions of people around the world want to learn English. Many of them come to Britain (and other English-speaking countries) to study at language schools, especially in the summer. There are thousands of different schools. They offer courses for children, teenagers and adults, there are courses in General English, Technical English, Business English and so on.
You should always try to find out as much information as possible before you choose a school. In particular, you should try to talk to other students from your own country who have been to a language school to find out what you should expect.
If you go to a language school, you should try to speak English as much as possible. Students usually stay with a local family. This is a good opportunity to improve your English and to learn a lot about everyday life. You should also try to mix with students from other countries. This will help you with your English, and will also show you how important English is for international communication.