What is the use of <apex: pageblocksectionitem> tag in the Salesforce Visualforce Page?

<apex: pageblocksectionitem> : It is used to define a single piece of data in an page block section that takes up one column in a row. It can include up to two child components.

Example:

<apex:pageBlock title="Block" >
             <apex:pageBlockSection title="my section">
                <apex:pageBlockSectionItem >
                	<apex:outputLabel >My Name</apex:outputLabel>
                </apex:pageBlockSectionItem>       
                 <apex:pageBlockSectionItem >
                	<apex:outputLabel >Address</apex:outputLabel>
                 </apex:pageBlockSectionItem>
            </apex:pageBlockSection> 
        </apex:pageBlock>