Final answer:
The difference is that 에 indicates a static location or point in time, while 에서 is used to show the location of an ongoing action.
Step-by-step explanation:
The difference between 에 (e) and 에서 (eseo) in Korean mainly pertains to their usage in expressing location and activity. 에 is typically used to mark a static status or location. It can denote a point in time or a destination. For instance, 학교에 (“To school”), signifies the destination to which someone or something is going. On the other hand, 에서 indicates the location where an action takes place. An example would be 학교에서 공부해요 (“Study at school”), where studying is the activity occurring at the school.