there is quite a difference between the two which yourself and steadyguy pointed out
Basically
dynamic - forever changing and never being the same, Just like your IP address if you have DialUp or a dynamic IP if your on Broadband, it will keep changing depending on your sessions expirity date/time. This is also an automatic thing so no user has to change anything. (Unless your adding news through form to database) etc.
Static on the other hand stays the same. And to be changed must be done manually i.e. a user must physically change the information themselves.