What's the largest difference between an Aura component and an SLDS component in Salesforce?

Hi Deepak,

Aura Components: Using Aura Framework We can build apps completely independent of the Data present in our Salesforce org.When we use Lightning Components  Framework We do not need to worry about the optimization of our apps for different devices as  Components take care of that by themselves.

SLDS: By Using SLDS We can make our apps responsive and can also provide Look and feel similar to the Lightning Experience. It provides a robust grid system because of which It is easier to build responsive layouts that work elegantly across different screen sizes.

Thanks.