Does it mean Jewish people?
Hassid does not mean the Jewish people as a whole. The term Hassid traditionally refers to a uniquely pious Jew who lives a life of holiness and special adherence to religious law. Today it refers to an adherent of a specific school of thought developed in the 18th century by Rabbi Israel Baal Shem Tov (literally ‘Master of the Divine Name’). This school not only emphasized holiness but also the importance of emotions and prayer (as opposed to religious study) as the center of religious observance.
A Hassid of today follows the instructions and teachings of one of a number of religious leaders (known as Rebbes) who each have their own take on the Baal Shem Tov’s teachings. They can be identified by the unique clothing they wear such as special kipot or fur hats, which distinguish them from other Jews