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Filter effects

There are situations, where basic shapes do not provide the flexibility you need to achieve a certain effect. Drop shadows, to provide a popular example, cannot be created reasonably with a combination of gradients. Filters are SVG's mechanism to create sophisticated effects.

A basic example is to add a blur effect to SVG content. While basic blurs can be achieved with the help of gradients, the blur filter is needed to do anything beyond.

You will get a full reference on SVG Filter effects on W3C Recommendation.

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https://developer.mozilla.org/en-US/docs/Web/SVG/Tutorial/Filter_effects