Final answer:
A relational database is a database in which information access is limited to the selection of rows that satisfy all search criteria. It uses SQL to perform queries and retrieve specific data.
Step-by-step explanation:
A relational database is a database in which information access is limited to the selection of rows that satisfy all search criteria. Relational databases are organized into tables with columns and rows, and they use SQL (Structured Query Language) to perform queries and retrieve specific data.
For example, let's say you have a table called 'Students' with columns like 'Name', 'Age', and 'Gender'. If you want to retrieve all the rows where the age is greater than 18 and the gender is 'Male', you can write a SQL query to search for that specific criteria and return the matching rows.
This type of database is commonly used in various fields, including business, healthcare, and finance, as it provides a structured way to store and retrieve data efficiently.