stockfish - Why do Engines show a fraction for the Depth and Current Node values? - Chess Stack Exchange

Forgive me if this has been asked elsewhere, but I've both Googled and searched here at CSE and cannot find an answer. When I'm using an Engine for analysis (in this case, Stockfish 15), I've noticed

In a negamax alpha-beta search for chess, how important and efficient is move ordering, and how can one implement it? - Quora

Do you think chess engines ruined the thinking? - Quora

Dissecting Stockfish Part 2: In-Depth Look at a chess engine, by Antoine Champion

Why does Stockfish give 2 slightly different evaluations and lines at the same depth and in the exact same position depending on how the position was reached? : r/chess

engines - Is Houdini 6 a Stockfish clone? - Chess Stack Exchange

Why can Stockfish give different evaluations at the same depth? - Quora

Engine doesn't recognize best move - Chess Forums

stockfish - How many moves out do the static board evaluations use? - Chess Stack Exchange

Techniques used for stockfish engine selectivity? : r/ComputerChess

High-level explanation

Stockfish - Chessprogramming wiki

AlphaZero plays attacking chess, like Tal. Does this demonstrate that, all else being equal, attacking chess is better than prophylactic chess like Petrosian's or Karpov's? - Quora

winboard - StockFish under WIndows 8 doesn't work - Chess Stack Exchange