Differences between HB pencils - Arts & Crafts Stack Exchange

Pencils seem to have different types: From what I've seen, there's a few types: HB 2HB B and so on. What's the difference between all the different pencils? When do I use one or the other?

6 X Assorted Soft Lead Sketching Artist Pencils Drawing Graphite Graded 8B to HB

ART SKETCHING COLOURING PENCILS IN CASE 12 GRADED HB DRAWING/SHADES/LIGHT/DARK

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The Difference Between H and B Pencils

Differences between HB pencils - Arts & Crafts Stack Exchange

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Lyra Super Ferby Graphite Pencil

paper - Drawing a newborn baby - Arts & Crafts Stack Exchange

Buy the Tombow Mono Drawing Pencils 6/Pkg & Eraser Set-2h, Hb, B, 2b, 4b & 6b (61002) 085014610025 on SALE at www.

HB Hex Pencil with Eraser – The Paper Mouse