What are certificates?

I have 'certificates' in my login keychain that indicate they have 'expired' and I cannot access certain websites.  This may be causing me problems with my email as the certificates relate to my internet provider.  Would it be o.k. to delete these expired certificates and would new ones then automatically be created?  I notice there are also expired ones relative to my apple email, but there appear to be newer ones now being uses.  I am completely in an area I do not understand or are familiar with, but I am in desparate need of resolving my problem in order to get me email up and running!!! 
I am using OSX 10.8.5 on a Mac Mini and my internet is working just fine.
Thanks.

Certificates are special information about another server (e.g. your email server) that let your Mac mini establish an encrypted (secure) connection with them. They also help establish the identify of the remote server.  As they are generally purchased from security companies that are meant to validate the identity of the requestor, they don't last for ever as a business might stop trading and no longer be entitled to use a certificate.  (Hope that makes sense).
It's normal to have expired certificates.  It is also OK to delete expired certificates, although normally the mail program or browser will prompt you and they are updated on the fly.  If you delete an expired certificate, you should be prompted to accept the new one, assuming your Internet provider has purchased new certificates that are current.  If you are still having trouble, I would imagine your internet provider could walk you through the steps required as they will know more about the specifics of their certificate.
Hope that helps.
Ivan

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