An impression indicates that some content was loaded on the page and was viewable.
A view means that the content was viewed. The count for videos occurs after only 3 seconds, we cannot be certain it was a purposeful view.
For other post types, determining whether content has been viewed is tough: LinkedIn must rely on things like "see more" link clicks to determine whether the audience has taken a genuine interest in the content.
Understand more about the different content views by clicking here.