Suggest me the best antivirus applications for Android 4.3

Hello there,
I am very much worried about the security of my smartphone. My smartphone has Android 4.3 installed in it and I have a lot of work which requires connecting to the internet.
Please let me know any anti-virus, malware application that can prevent my phone from threats in internet.

While Avast & Avira seem to be topping the charts as free softwares for android phones, you can give a shot to quick heal AV for android. Its paid but very effective as I use it for my android based phone too.