What's the difference between Netscape SDK for Java & JNDI?

I know I can use either JNDI or Netscape SDK to access iDS. So whats their differences basically?
Why would I need JNDI/Netscape SDK if I can just use either of them to access iDS?
Thanks!

Netscape SDK for JAVA developed only for iplanet Directory Server but JNDI for any directory server.
JNDI has classes provided by Sun that will help your application interact with an LDAP server.JNDI applications work similarly to JDBC applications - write applications once and be free to use "drivers" from different vendors. Sun provides the "driver" that will help interact with the LDAP server. Sun also provides "drivers" for other naming services (like CORBA, Netscape).
The Java Naming and Directory Interface (JNDI) allows Java applications to use a single set of methods to access multiple naming and directory services such as LDAP and NIS.
JNDI is a Java API that provides a common way for programmers to access a variety of naming and directory services. The API consists of several packages:
javax.naming for naming operations (access entries)
javax.naming.directory for directory operations (access attributes)
javax.naming.event for requesting event notification
javax.naming.ldap for LDAP-specific features.
JNDI operates through a layer of software called a Service Provider. The Service Provider implements the JNDI operations in terms of a particular underlying protocol.
JNDI's Service Provider Interface (SPI) allows you to select Service Providers at runtime. In many cases you can use the same JNDI methods regardless of whether the Service Provider is talking to an LDAP server or using another protocol such as NIS. In order to access all of the functionality of the LDAP protocol, however, you will have to use methods outside of this abstraction.

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