ELI5 is short for “Explain Like I‘m 5 (years old)”.
This is a popular way to ask if a simpler explanation can be given. One that theoretically could be understood by a 5-year old. This could be functionality, an idea, tokenomics but also news stories.
ELI5 can be used as a verb: “Can you ELI5 this for me?”, but also as a noun: “This ELI5 is excellent, even my pet understands ease Uninsurance now”.