Logic behind Postgres binary installation path on Debian

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http://unix.stackexchange.com – It appears that the Postgresql installation is split into three folder locations on Debian: Configuration: /etc/postgresql Binaries: /usr/lib/postgresql Data: /var/lib/postgresql I understand the benefits of splitting up the configuration files and the data, however, the binaries location is confusing to me -- why wouldn't it simply be in /usr/bin? More to the point, why would some binaries go into /usr/bin and others into /usr/lib? (HowTos)