Apache is the number one Web server software in the world. It can run on almost all widely used computer platforms and is widely used because of its cross-platform and security. It is one of the most popular network server-side software. At the same time, Apache is transliterated as Apache, a tribe of North American Indians named Apache, located in the southwestern United States. It is also the name of a foundation, helicopter gunship, etc. Apache is characterized by simplicity, high speed and stable performance, and can be used as a proxy server.

Tomcat is the core project of Apache Software Foundation in Jakarta, which is jointly developed by Apache, Sun and other companies and individuals. Thanks to Sun's participation and support, the latest Servlet and JSP specifications can always be reflected in Tomcat, and Tomcat 5 supports the latest Servlet 2.4 and JSP 2.0 specifications. Because of its advanced technology, stable performance and free, Tomcat is deeply loved by Java enthusiasts and recognized by some software developers, and has become a popular Web application server at present. The latest version is 7.0.

Open Database Connection (ODBC) is a part of Microsoft Open Service Architecture (WOSA), which establishes a set of specifications and provides a set of standard API (application programming interface) for accessing databases. These APIs use SQL to accomplish most tasks. ODBC itself also provides support for SQL language, and users can send SQL statements directly to ODBC.

If you plan to learn application development based on ODBC API, the best reference material is MSDN. If you plan to learn how to develop an ODBC driver, the best reference is MSDN. If you don't intend to use ODBC API for development, learning and understanding ODBC can also increase your understanding of DBMS and better understand other database access interfaces and technologies.