What android apps can do these?

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http://forums.androidcentral.com – Hello guys, 1) What app do you install to prevent theft? If some one steals your phone, which app can help you recover the phone or find the thief? 2) When using the phone or using the phone as GPS, someone runs by and steals your phone, is there any app that can help you to take back your phone or prevent phone from stolen? 3) Do I need to install any security/malware/antivirus apps for android phone? I am new to smartphone android and I am using S4, thanks in advance for helping. Thanks (HowTos)