Avast Anti Virus: -

Packed with the largest threat-detection network, machine-learning virus protection, easy password management and home network security that won’t slow down your PC.

Avast Free Antivirus scans for security and performance issues and tells you how to fix things instantly.It protects you in real-time by analyzing unknown files before they get to you. So relax: With Avast, you’re running the most trusted antivirus out there.

Introducing Behavior Shield
We don’t just check your applications for malware. We now keep an eye on their behavior to make sure they don’t suddenly go rogue.

Avast Anti-Virus

AVG Internet Security: -

The heart of AVG Anti-Virus is the checking engine - you can imagine it as a "black box" into which requests to check objects are entering and the box returns information indicating if these objects are virus-free or infected.
The checking engine includes an application interface for communication with other AVG Anti-Virus components (Resident Shield, Tests, E-mail scanner modules and plugins etc.) which use this service. It was created with emphasis on AVG Anti-Virus modularity and is common for all mentioned components.

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AVG Home Page
AVG Anti-Virus