What is a Database?
Database is an organized way of storing information, making it easy to get the information at later time.
Eg, storing organized data in Excel file(.xlsx file extension) is called Excel database. storing data in microsoft sqlserver file(.mdf file extension ) is called Sql database.
What is database software ?
Database Software is a tool to store organized data. Examples of database software will be
Excel, Sql Server, Mysql, Sqllite, postgresql,Apache Cassandra , google big table etc.,
Types of Database
Hierarchical Databases -- data is organized like a Pyramid. Oldest method of storing data.Used in IBM mainframe Computers
Network Databases - same like hierarchical database but this has an hierarchical structure.
Relational Databases - This is used in sql server where the data are linked by relationships (using keys)
Object Oriented Databases - This kind of database can be used to store variety of media sources such as images,text,videos etc.,
Free Database Softwares
MySQL-- MySQL is a widely used opensource Database.
PostgreSQL-- This is another Famous open source database.
All the above three databases are cross-platform which means it support multiple operating systems like linux,Windows,Mac OS X, Solaris , FreeBSD etc.,
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