What Is Point of View in a Novel
Point of view is a question about access: who is perceiving the events of the story, and how much can that person see into anyone else's mind. A story told in the first person by someone who only knows their own thoughts is one kind of access. A narrator who can drift into any character's head at will is a very different kind, even if both happen to be written using "he" and "she" throughout. Point of view describes what the telling is allowed to know, not which pronoun it happens to use to say it.
Where the confusion comes from
Point of view gets treated as if it were simply a grammar choice: first person, third person, and that's the whole conversation. Grammatical person is only the surface. Two novels can both be written in the third person and still work completely differently, because one lets the narration into a single character's thoughts and nowhere else, while the other moves freely between several minds, or refuses to enter anyone's mind at all and reports only what could be seen from outside.
How this shows up in a real novel
Wuthering Heights (Emily Brontë, 1847) nests its point of view rather than fixing it in one place: Mr. Lockwood narrates his own visits to the house, but most of the story reaches the reader through Nelly Dean, the housekeeper, recounting events to Lockwood that she witnessed, or was told about, years earlier. The access keeps shifting one layer removed, so the reader is never quite hearing events directly, only someone's account of someone else's account, which changes how much any single version of the story can be trusted.
While you're drafting
A scene that feels oddly distant is often a point-of-view problem rather than a prose problem, worth checking against exactly whose access the passage is supposed to be limited to.
Questions
Is point of view the same as first or third person? No. Grammatical person is only part of it. Point of view also covers how much the narration can see into anyone's mind, which varies enormously even within third person alone.
Can a novel use more than one point of view? Yes, in many different ways: alternating chapters between characters, a narrator reporting what other people told them, or several accounts nested inside each other.
Why does point of view matter for revision? Because a scene that feels flat or distant sometimes isn't a writing problem at all. It's an access problem: the narration is trying to know something it was never actually set up to know.