  AGB stars are the source for the main component of the $s$-process. Here we
discuss both the properties which are reasonably well known and those which
still suffer from substantial uncertainties. In the former case, we are fairly
sure that the $s$-process contribution from AGB stars comes from masses between
about 1 and 3 $\msun$, and the dominant neutron source is the
$^{13}$C$(\alpha$,n)$^{16}$O reaction. In the latter category remains the
formation mechanism for the $^{13}$C-pocket. Attempts at including rotation
seem to inhibit neutron capture reactions. Explaining the observations seems to
require a spread in the size of the $^{13}$C-pocket so some stochastic process,
such as rotation, must be involved.
