HelpText to a field in visualforce Page.

With the help of "helpText" attribute of <apex:pageBlockSectionItem> tag, we can provide helptext to a field
Visualforce Page:
<apex:page standardController="Account">
    <apex:form>
        <apex:pageBlock title="My Content" mode="edit">
            <apex:pageBlockButtons>
                <apex:commandButton action="{!save}" value="Save"/>
            </apex:pageBlockButtons>
            <apex:pageBlockSection title="My Content Section" columns="2">
                <apex:pageBlockSectionItem helpText="Name of Account">
                    <apex:outputLabel value="Account Name" for="account__name"/>
                    <apex:inputText value="{!account.name}" id="account__name"/>
                </apex:pageBlockSectionItem>
                <apex:pageBlockSectionItem helpText="SIte associated with this Account">
                    <apex:outputLabel value="Account Site" for="account__site"/>
                    <apex:inputText value="{!account.site}" id="account__site"/>
                </apex:pageBlockSectionItem>
                <apex:pageBlockSectionItem>
                    <apex:outputLabel value="Account Type" for="account__type"/>
                    <apex:inputText value="{!account.type}" id="account__type"/>
                </apex:pageBlockSectionItem>
                <apex:pageBlockSectionItem>
                    <apex:outputLabel value="Account Number" for="account__number"/>
                    <apex:inputText value="{!account.accountNumber}" id="account__number"/>
                </apex:pageBlockSectionItem>
            </apex:pageBlockSection>
        </apex:pageBlock>
    </apex:form>
</apex:page>
Output: