By interacting live with people from all over the world, you can use non-native languages on a daily basis and thereby help developing your foreign language skills.

thereby 是由 there（那里）和 by（通过）组成的副词，字面意思是"通过那种方式/途径"，在句中表示前文所述行为导致的结果，相当于汉语的"从而""因此"。