Difference between orthodox jew and hasidic jew

The Hasidim are Haredi (Ultra-Orthodox), the most conservative members of the Orthodox branch of Judaism. Unlike other Orthodox groups, they place great emphasis on joy and spirituality. (The Hasidic movement started as a reaction against the perceived overly "academic" nature of Judaism at the time). 

Hasidim wear distinct clothing that other Haredi and Orthodox Jews may not wear. They wear their tallit katan over their shirts, while other Orthodox Jews wear them under their shirts with only the tzitzit hanging out. 

Hasidic men also practice mikveh immersion daily before morning prayers, whereas most male Orthodox Jews only practice mikveh immersion on special occasions.

Hasidic Jews are a sub-grouping of Orthodoxy. They are more conservative, often live in insular communities. They try to abide every law and also try very hard not to assimilate and that is why they live mostly (if not always) in communities with other Hasidim. 
they are the "ultra-Orthodox" (although this is a term that is not used by the Hasidic, since it gives off an extremist vibe).