Identification = belief = velcro = ego.
At least roughly.
Identification is when mind takes on the viewpoint of a story, and holds it as true and real. Mind identifies with the view of the story, filters experience through it, and even acts as if it’s true.
A belief is when mind holds a story as true, and perceives and acts as if it’s true, at least to some extent. (Often, it’s not a 100%.)
Velcro is when sensations seem “stuck” on associated images and words, giving them a charge, and lending them a sense of reality, solidity, and truth. The images and words feel true, because of the associated sensations.
Ego can be used in a psychological and “spiritual” sense. In a psychological sense, it’s just the operating system that allows this human being to function in the world, and we want it to be healthy and keep maturing. In a “spiritual” sense, the “ego” refers to identification and what comes out of identification. (Or a belief or velcro, and what comes out of these.)
These are all words describing roughly the same. It’s all referring to the mind identifying with a story, and what that brings with it.
What does it bring with it? Here are some possible consequences: Filtering perception through that story, acting as if it’s true, perhaps wanting to defend the story, dismissing what doesn’t fit, perhaps discomfort or suffering when life goes against the story, finding people who agree and support our story, and more.