Program for memory usage?

[iCe Cube]

Does Mac OS X (Tiger) have a built in program for viewing the memory usage of different applications that would be running at that time? If not could someone recommend a good 3rd party freeware that shows me memory usage (or a widget or something) ?

Thanks

 

[Lacero]

Activity Monitor?

 

[iSaint]

SysStat widget

 

[Mitthrawnuruodo]

...or use the top command in Terminal.app?

But if you want a broader system monitor, available all the time, which doesn't take too much resources, I recommend XRG. Enables you to monitor all kinds of info right off your Desktop (color scheme is customizable ):

 

[iCe Cube]

Thanks everyone for the replies. I am using Activity Monitor which seems good enough. I can't believe I hadn't seen it. Silly me!