Technically today the most often used database is actually Excel. More companies have more of there data in Excel and use Excel to work with that data than any other database platform.
As far as actual relational databases go the big players are: DB2, Oracle and Microsoft SQL Server. MySQL is gaining in popularity. There are other database platforms such as Sybase, Informix, Microsoft Access, TeraData, Progress, FoxPro, etc which all have smaller market shares.
I must argue that excel is NOT a database system. it is a flat file that does not act or work like a database system. Yes it is true that a lot of companies use excel to keep their data in, but it does not act as a database system. you cannot have multiple people in a single excel file making changes and updates at the same time, (one person can be making the changes but the others would see it as READ ONLY), where as a database system you can have thousands of persons accessing and changing data depending on how robust the system is and how well it was designed. as for the other information, it is correct.
***/buddyfarr***Whatsup guys???? I thought I might edit this answer with some of my knowledge! ermm….. excel is cool… um.. yeah.