What does the symbol "@" mean?

I am looking over some code and I was wondering what
"     @Basic
     @Column(name = "active")
mean?
I understand that @ are used in comments, but there these two lines are inserted between some private variable declarations, and the compiler doesn't give an error. Anyone know what it does/mean?
Thanks

They are annotations.
[http://java.sun.com/j2se/1.5.0/docs/guide/language/annotations.html|http://java.sun.com/j2se/1.5.0/docs/guide/language/annotations.html]
They can be used for all sorts of wonderful purposes, both at compile time and run time.

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