How to pass values across Salesforce Lightning Applications?

Hi Yogesh,

Suppose, There are two components

<aura:component>
<aura:attribute a/>
</aura:component>
and

<aura:component>
<aura:attribute b/>
</aura:component>
and you need to pass first component's value a to second's b.

Then

<aura:component>
<aura:attribute a/>

<c:secondcomp b="{!a}">

</aura:component>

Thanks