A userbox is somewhat like an infobox, but intended for use on a user page instead of an article. By convention, the names end with "userbox" to make it obvious they are userbox templates.
Examples
Examples shown on individual template pages are not constrained in width—the width is specified in {{userboxtop}}. (Generally speaking, you should always place userboxes between {{userboxtop}} and {{userboxbottom}}.) Here is what they ought to look like.
Pages in category "Userbox templates"
The following 20 pages are in this category, out of 20 total.
A
C
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G
H
I
M
N
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N cont.
O
R
S
U
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