What is Java and why do I need it, and is it safe yet?

It's my understanding Oracle has not put forth a true "fix" on the lack of security for Java. I don't really understand what Java is or why I need it, but what I don't want is something that allows cybercriminals a way into my computer.
I currently have Java disabled but strangely enough just today I received an alert that I had a Java update that I should download, (which I have not done as yet.)
Would appreciate any assistance.
Thanks,
jr
10-20-2013

You should always have the latest Java version installed (current is 7U45) even if you have disabled the Java plugin in Firefox or uninstall Java completely.
Note that current Firefox version will not enable the Java plugin.
*https://support.mozilla.org/kb/how-to-enable-java-if-its-been-blocked

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