New Google Logo

On 1st September 2015 Google has introduced with their new logo. Now Google icon is changed form small ‘g’ to four colored capital ‘G’.New Google Logo
In a official Google blog post they said:

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Today we’re introducing a new logo and identity family that reflects this reality and shows you when the Google magic is working for you, even on the tiniest screens. As you’ll see, we’ve taken the Google logo and branding, which were originally built for a single desktop browser page, and updated them for a world of seamless computing across an endless number of devices and different kinds of inputs (such as tap, type and talk).
It doesn’t simply tell you that you’re using Google, but also shows you how Google is working for you. For example, new elements like a colorful Google mic help you identify and interact with Google whether you’re talking, tapping or typing. Meanwhile, we’re bidding adieu to the little blue “g” icon and replacing it with a four-color “G” that matches the logo.

See the logo changing history of Google in this YouTube video: