Interpreting package version number

To: debian-user <debian-user@lists.debian.org>
Subject: Interpreting package version number
From: Richard Owlett <rowlett@cloud85.net>
Date: Wed, 16 Jan 2019 05:22:24 -0600
Message-id: <[🔎] 2abf4a96-6118-1f2c-116c-9bd91339bd0d@cloud85.net>

I'm running Stretch and have just installed Tcl from repository.
Synaptic reports the installed version is 8.6.6+dfsg-1+b1 .
The current upstream version is 8.6.9 .

I don't understand what "+dfsg-1+b1" is telling me.
Where is that numbering scheme described?

My goal is to understand (from upstream docs) how what I have installeddiffers from the current upstream version.

TIA

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