JDBC (Java Database Connectivity) is uses for connect java application with database. It is Java SE technology, which is install automatically with the JDK software. JDBC is an API (Application programming interface) used to communicate Java application to database in database independent and platform independent manner. It provides classes and interfaces to connect or communicate Java application with database.
Before reading This Tutorial you need basic knowledge of Core java and most important some topics are required like Abstract, Interface, Exception Handling, Collection Framework etc.
Path variable is set for providing path for all Java tools like java, javac, javap, javah, jar, appletviewer which are used in java programming. All these tools are available in bin folders so we set path upto bin folders. Difference between path and classpath in Java
Classpath variable is set for providing a path for predefined Java classes which is used in our application. All classes are available in lib/rt.jar so we set classpath upto lib/rt.jar. Difference between path and classpath in Java
Cloud computing is the on demand availability of computer system resources, especially data storage and computing power, without direct active management by the user. Cloud Computing Tutorial