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smita bhargavasmita bhargava 

design component in lightning component

In the lightning component bundle I have the design  component.

Please let me know what is the difference between this and the markup.

In what specific situations do we need to create a <design:component>. 

A specific example with clarity will be helpful to understand.

Raj VakatiRaj Vakati
 If you add design attributes to you component bundle then they can be configured via the Lightning Page Builder. means if you want to pass any information from the Lightning app builder you need to expose those attribute to the designer