Q:

"Causal loops are unchanging and self-originating, whereas time loops are constantly resetting".. What does it mean?

Recently I've started reading about Time Travel after watching it in Harry Potter and the Prisoner of Azkaban. There is a line on this subject in the Wikipedia page on 'Causal Loop' i.e.

The term "time loop" is sometimes used to refer to a causal loop, but although they appear similar, causal loops are unchanging and self-originating, whereas time loops are constantly resetting.

The above highlighted idea is present in various other articles as well in slightly different words. However, everywhere it's just this line and then full stop. No explanation. No elaboration.
Can anybody explain what this statement really means?

A:

Causal loop - the changes brought forth by the loop create the conditions that cause the loop. Nothing changes, ever.
Time loop - a change in the past will (or at least might) create a different future. Do not, rpt. not kill your grandfather, or you might actually disappear.

A:

To quote this footnote, number 29, in the Wikipedia on Causal Loops:

Novikov, Igor (1983). Evolution of the Universe, p. 169: "The close of time curves does not necessarily imply a violation of causality, since the events along such a closed line may be all 'self-adjusted'—they all affect one another through the closed cycle and follow one another in a self-consistent way."

This suggests that causal loops and time loops are equivalent. The main difference may be that causal loops are strictly causal sequences of events with the events repeating exactly the same sequence without any change. The final causal outcome will be fixed.
A time loop consists of a causal sequence of events that do not strictly repeat events exactly, but preserve the final causal outcome. Effectively the final causal outcome will be fixed, in the sense that it cannot be changed.
Both loops are sufficiently close in kind to each other to almost be equivalent and barely distinguishable from each other. The distinction between them is arbitrary.

