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Sree SalesforceSree Salesforce 

How can i understand the below flow force:slds. In Lightning Do i need to use this framework flow is mandotory? Do i have any other option.

<aura:application extends="force:slds">
   <div class="slds"> 
      <div class="slds-page-header"> 
        <div class="slds-grid">  
          <div class="slds-col slds-has-flexi-truncate">  
              <p class="slds-text-heading--label">Expenses</p>
              <div class="slds-grid"> 
                <div class="slds-grid slds-type-focus slds-no-space">
                    <h1 class="slds-text-heading--medium slds-truncate" title="My
                    Expenses">My Expenses</h1>
      <c:ExpenseCmt /> 
Best Answer chosen by Sree Salesforce
hi manne
go to below link for understand force:slds extends

i hope it helps you.
Let me inform if it helps you and kindly mark it best answer if it helps you so it make proper soltuions for others