what is the use of signing keys?

[Douglas Elznic]

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Hello,
 I noticed that a few people have siging keys and encrypting keys. Can
Someone explain to me the reasons for having two or more keys for
certain tasks? Thanks to everyone for answering all my questions...

--=20
+------------------+---------------------------------------------------+
|  Douglas Elznic  |        GPG Key: <dfe@anize.org> 0x13300731        |
+------------------+---------------------------------------------------+
|  Thinker-@-Large | Pub key can be obtained from http://pgp.dtype.org |
|   dfe@anize.org  | Fingerprint:                                      |
| dfelznic@syr.edu | EF9C 7E3C 0327 EAAF 1E20 5299 0805 7531 1330 0731 |
| http://anize.org | All emails should be signed by the above key.     |
+----------------------------------------------------------------------+
| They that can give up essential liberty to obtain a little temporary |
| safety deserve neither liberty nor safety... Benjamin Franklin 1759  |
+----------------------------------------------------------------------+

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Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org

iD8DBQA7x481CAV1MRMwBzERAkbUAJ0eB2hsXJFMMIcIknmCB5AQmLWEqwCgqo0L
lV5GahT2lv3JZ9DPlqVlyOw=
=rDwi
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