My mac is trying to download security software, do I need it?

I am a new mac user. My mac started downloading security saying it was necessary to remove whatever I had been infected with. I stopped the download. I bought a mac because I was told I did not  need to worry about security. Do I need security? Is there a mac security software that downloads itself? Also my mac has frozen a few times and I have had to hold the power button to reset. Is this normal?

From another post on this site.
AntiVirus sw will not fix this issue because it is not a virus. It is an installed program that was given permission to run by the user.
it is easy to remove, but there are several steps:
-have user quit all apps
-have user force quit safari
-have user open activity monitor and force quit mac defender/Security/Protector
-quit activity monitor
-have user delete mac defender/Security/Protector from downloads & applications folder
-have user do a Spotlight search for 'MacDefender/Security/Protector'/'Mac Defender/Security/Protector' and move any Mac defender/Security/Protector files to the trash
-have user go to system prefs>accounts>login items> and delete mac defender/Security/Protector from start up list
-have user restart
-have user empty trash

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