what is spam ?

what affect spam have on your system? none at all or a litte affect? how do kill spam is their any software that you can use to kill spam out their can get me some name of one item that will kill spam

question

1.what affect is have on your harddrive and memory
2.going different web site and some time pc just hang their for some reason now clip on to close you get a bell sound not able to close out from that side now power your pc off