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In terms of redundancy:
Active/Passive means you have two servers, a primary and a secondary. The primary is the server you use everyday. The secondary server is a cold standby in case your primary server encounters issues.
If the primary server does encounter debilitating issues, your hosting company will often manually transfer your services to the secondary while the primary is being repaired.
Active/Active means you have two servers, a primary and a secondary. Both primary and secondary servers are online and often clustered so when one server is updated, so is the second.
In the event of a primary server failure, the secondary will automatically kick in. As all information up to the failure has been shared between the servers, the secondary is able to just pickup where the primary left off until the primary can be repaired.
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