How did China stop the corona epidemic?

China is using its elaborate surveillance system in the war against Corona.

He is not only constantly tracking people through technology, but through this he is also preventing the spread of corona virus.

According to official data, there has been a significant decline in recent cases of corona infection in China. Where there used to be a thousand cases of infection daily here five weeks ago, now the new cases here are almost equal to zero.

Like China, many other countries are using or planning to use surveillance systems to prevent corona from spreading. They are monitoring the person by tracking GPS. But is this an effective method?

And is it helping to prevent the corona epidemic?