Should I get a router for security?

My iMac connects to the Internet using a DSL modem through SBC/Yahoo with a static IP address.
I've never used a router...should I get one for security? (I wouldn't get a wireless probably.)
If I get a router, what steps are necessary to install it. Different network preferences?
I know nothing (never gave a router any thought in seven years of DSL service). Thx.

Dianne, I see you have another post on the same matter. Aside from the advice given there why not unplug the router at either end? If it still works then, tell us the make as it is a remarkable device. This ignoramus has often used the unplug to stop a connection either from a router to the internet or computer to printer or whatever, rather than consider some complicated manipulation of the software. The only other use for the router I can see is direct connection between computers and you don't suggest that.
Here in the UK the BT network which handles part of the internet route sometimes does not drop for some time after breaking the connection and the persistant links cause a "stale" connection and a failure to reconnect. The usual advice is to wait 30 mins before logging on again. That is the only snag with my cheap and nasty disconnection.

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