Any relation between initial install and creation of a SF self-signed certificate?

[Bia]

I have a customer that has received notice that a self-signed certificate in Salesforce is expiring in 10 days. I do not know why this certificate exists and can find nothing to correlate except that C&P was installed on the same day. The purpose of the certificate; SelfSignedCert_08Mar2014_150936, is either to "authenticate single sign-on with an external website, or when using your organization as an identity provider. You only need to generate a Salesforce certificate if an external website needs verification that a request is coming from a salesforce.com organization.Mutual authentication certificates are used when an HTTPS request is made to a salesforce.com organization from a third-party service on a specified port. Contact your salesforce.com support representative to enable this feature. " Was this something C&P needed and if so, what happens when it expires? Thank you.
Regards.

[CnP.Support]

Good day @Bia,

I have not seen this issue before so we researched it further and found the following 2 articles:

• https://help.salesforce.com/apex/HTV...s_creating.htm
• https://developer.salesforce.com/for...0000000MGlBIAW

Please let us know if this answers your question.