What is the difference between backlog, roadmap and changelog?

Question

Programming

Hello.
I was puzzled by the question of what is the difference between backlog, roadmap and changelog?

Answer 1

Changelog - a list of project changes that have been made;
Roadmap - a list of possible planned future changes to the project;
Backlog - (not exactly sure) a list of what should be in general (requirements, changes, etc.)

Answer 2

changelog - changes in the project
roadmap - planned tasks / developments, both internal and visible to the end user
backlog - list of functions required by the end user. Usually part of a roadmap