MongoDB Connection bean declearation

Anybody have an idea about what is the difference b/w :

<mongo:mongo host="localhost" port="27017"/> <mongo:db-factory id="mongoDbFactory" dbname="yourdb" />

and

<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">       <constructor-arg name="mongo" ref="mongo" />        <constructor-arg name="databaseName" value="yourdb" />  </bean>
<bean id="mongo" class="org.springframework.data.mongodb.core.MongoFactoryBean">        <property name="host" value="localhost" />  </bean>