What is a database

Databases are like large buckets that store data in an organized manner. A few examples of when we would like to create a database: 
 
 
 A database for a university to save data about students, courses, and lecturers. 
 A database for a car agency to track sales, car storage, and workers. 
 A database for a hospital to save information about patient's history to provide good health care 
 And many more 
 
 
 Inside a database there are tables, and each table has a name, column names, and rows. For example, this is a  workers  table: 
 
 
 
 
 
   
 firstname 
 lastname 
 age 
 exp_years 
 gender 
 
 
 
 
 1 
 Ghully 
 Thuas 
 29 
 2.3 
 Female 
 
 
 2 
 Bostal 
 Shkolky 
 32 
 0.2 
 Male 
 
 
 3 
 Qaostu 
 Malop 
 21 
 4 
 Female 
 
 
 
 
 
 The  workers  table has 5 columns and 3 rows. We don't need any tool to know that we have 3 workers and it is easy to calculate the average age of all of them  (29 + 32 + 21) / 3  but what happens when we have a thousand rows or even a million rows? 
   
 For that, we have databases and the SQL language. database stores all of the tables and SQL extracts the data.