Why are Databases Necessary?
Databases organize raw data. A database is made up of records. A record is made up of fields. If a record is a row of information, the the fields are columns of information. If five fields have information, then all five fields together make up one row, and all rows make up the database table.
Without databases, the raw data will not be organized and it will not be available in any manner that can be easily accessed.The easiest way to organize the data is using the concept of normal forms.
Normal forms break down information to its bare components so there is no duplication, repetition, or redundancy. For example, suppose a student enrolls in a college and signs up for four classes. The information contained might be name address, social security number, major, Class #1, Class #2, Class #3, Class #4, the day and time of Class #1, the day and time of Class #2, the day and time of Class #3, the day and time of Class #4, the teacher for Class #1, the teacher for Class #2, the teacher for Class #3, and the teacher for Class #4. As you can see, the database gets very big very fast.
But if you break it down by student Information, class information, and teacher information instead of one large database, you can have three smaller databases. You can link them by what they would have in common, namely the student.
Now you've made the database information accessible as well as manageable.