USAID to close? What is it known for?

The operations of the 64-year-old U.S. Agency for International Development (USAID) have been halted. Everything started after a tweet from Elon Musk, where he accused USAID of being a criminal organization, and claimed that Trump had agreed to shut down the agency. In the morning, the agency’s X account, which had nearly one million followers, was no longer active. The organization’s website is also inaccessible.