What is across protocol?

Excuse me, could you elaborate on what exactly is meant by the term "across protocol" in the context of cryptocurrency and finance? I'm interested in understanding how it functions, its purpose, and the potential benefits or limitations it may present in the industry. Is it a specific type of technology, a method of communication, or perhaps a way of integrating different systems or platforms? I'd appreciate it if you could provide a concise yet informative description.