Jack Dorsey, an American technological entrepreneur and philanthropist, is stopping his job as Twitter¡¯s CEO, giving control of the microblogging site that he helped start and built into a global communications platform.

Despite being widely used, Twitter has struggled to keep up with other social media platforms. Dorsey will help at the San Francisco company until his term ends in 2022. In a statement, Dorsey said that the company was ready to change from the people who started it.

Parag Agrawal, Chief Technology Officer who joined Twitter in 2011, was promoted to CEO. Dorsey said that Parag¢¥s work over the past 10 years had been transformational, and he trusted Parag and his skills. It was his time to lead.

Difficult words: philanthropist (a person who gives money to help people who are in need), microblogging (the activity of making short, frequent posts), transformational (producing a big change or improvement in a situation).