Xi Jinping Thought on Socialism with Chinese Characteristics for a New Era — typically shortened to "Xi Jinping Thought" outside of China — was first enshrined in the Chinese constitution at the last National People's Congress in 2017.
It's a set of personal and national ideals for the advancement of Chinese society that was developed by Chinese President Xi Jinping.
There are rumours it will be embedded even further at the upcoming congress, when Xi is likely to enter his historic third term as president.