Communication technology is an indispensable part of modern society, and its main function is to expand people's communication and information exchange ability. With the development of communication technology, people can communicate with others more quickly and conveniently, regardless of time and place. Here, we will focus on three aspects that communication technology is mainly used to expand people: social, business and education.

First of all, communication technology is mainly used to expand people's social skills. Through social networking platforms, people can easily keep in touch with friends, family and colleagues. No matter where you are, people can communicate anytime and anywhere as long as there is an internet connection. In addition, social networks also provide a platform for people to share their lives, exchange views and obtain information. Through social networks, people can learn more about their friends and communities and expand their social circle.

Secondly, communication technology is also mainly used to expand people's business ability. With the rise of e-commerce, people can buy goods and services through the Internet without leaving home. In addition, communication technologies such as e-mail and video conferencing also provide enterprises with more efficient communication methods. Enterprises can hold meetings, cooperate and communicate in different places, thus improving efficiency and productivity.

Finally, communication technology is also mainly used to expand people's educational ability. Through the Internet, people can easily access various learning resources, including online courses, teaching videos and e-books. In addition, communication technology also provides a more efficient way for students and teachers to communicate. Students can communicate and ask questions with teachers through e-mail or online chat, and teachers can also publish course content and homework through online teaching platform.

In a word, the development of communication technology has expanded people's social, commercial and educational abilities. Through communication technology, people can communicate and exchange information more conveniently, thus improving efficiency and productivity. With the continuous development of communication technology, we can expect more innovation and progress, and bring more convenience and development opportunities to human society.