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

Stockfish: Depth vs. TC

Depth and nodes - computer chess - Chess Forums

NPS - What are the Nodes per Second in Chess Engine Analysis

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

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

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

High-level explanation

What are some interesting math facts about chess? : r/math

PDF) Master's Thesis: Application of the Machine Coaching Paradigm on Chess Coaching

engines - What is the deepest Stockfish evaluation of the standard initial position that has ever been done? - Chess Stack Exchange

engines - Why does Stockfish evaluate this position as equal? - Chess Stack Exchange

Do you get better at chess at a faster rate when you lose constantly against people/engines who are better than you, or when you play people/ engines who are much worse and you

How do I use the analysis output of a UCI engine? - Chess Stack Exchange

engines - What does it mean when stockfish evaluates a move as an inaccuracy after previously thinking it was the best move? - Chess Stack Exchange

NPS vs Time-to-depth: What you should look at when analyzing with Stockfish