Can you explain in simple language for bread, why do you need ::?

Question

Angular

I've been looking everywhere and it's not very clear. Well, or am I stupid))) Can someone explain in what cases to use :: and what is it for?

Answer 1

Badly searched
When you display some value through ::, for example,
{{::name}}
after you change it, it will not change in the display, but will remain the same as it was at the first rendering
Actually, there is an example above on the first link