What is the difference between DLL and Ell?

Excuse me, could you clarify the distinction between DLL and Ell for me? I'm a bit confused as to how they differ, especially in the context of finance or cryptocurrency. Perhaps you could elaborate on their unique characteristics and how they might be applied in these fields? I'm particularly interested in understanding how they may differ in terms of functionality, purpose, or even their origins. Thank you in advance for your clarification.