What is an example of an ELL student?

Could you please provide an illustrative instance of an English Language Learner (ELL) student? It would be helpful if you could describe a specific scenario or characteristic that typifies an ELL student, such as a student who recently migrated to a country where English is the primary language of instruction and is still mastering the nuances of the language, or a student who faces challenges in communicating effectively in English despite being exposed to it for a considerable period.