Image optimization for websites is best with JPG and PNG, for animated images, GIF is right one as it is supported by all browsers. GIF image file format supports two types of images, one is a normal still image (which is not recommended to be used for a blog) and other one is an animated image file. Animated images provide a great functionality / add more value to any content you write.
Animated GIFs are used on websites to grab the attention of user towards the object to make them click on that. They are better than flash animations for reasons that they are comparatively easy to make, occupy less space and easy to use on webpages.
Such anims are nothing but a set of image frames which are set to repeat at a certain fixed interval. If you want to split animated gif image file into its frames / individual files, there are many software utilities available for free, but here are the ways to accomplish the same online without any softwares.
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