Database
An application’s data store
A database is an organized store of data from which an application or website quickly and reliably reads information and saves new records. It holds things like user accounts, orders, or products and makes sure the data stays consistent, available, and secure.
How a database works
A database stores data in a structured form so it can be searched and changed quickly. The application talks to it through queries: it asks for specific records, inserts new ones, or updates existing ones. The actual storage, indexing, and secure access are handled by the database system in the background.
The most widespread are relational databases (for example PostgreSQL or MySQL), which organize data into linked tables and use the SQL language. Alongside them are NoSQL databases suited to less structured data or very high load. The choice depends on what data and what volume of traffic the application needs to handle.
Why a database is the foundation of every application
Any system that needs to remember something between visits needs a database. An e-shop keeps products and orders in it, a booking system keeps appointments, a CRM keeps contacts and deals. Without it, all the data would be lost the moment the page is closed.
With a database, the design matters. A well-designed structure speeds up the application, saves space, and makes future development easier. Just as important are regular backups and security, because customer data is usually the most valuable thing a company has.
- Stores data permanently and makes it available to the application.
- Ensures the consistency and integrity of the data.
- Enables fast searching even across millions of records.
- Forms the basis for backup and recovery.
Need custom software with a database?
See our custom developmentFrequently asked questions
What is the difference between an SQL and a NoSQL database?
SQL (relational) databases organize data into linked tables and fit cases where exact structure and relationships matter, such as orders. NoSQL databases are more flexible and are used for less structured data or very high load.
Where is the database stored?
It runs on a server separate from the application itself, most often at a hosting provider or in the cloud. The application connects to it over a secure connection, so the data is not accessible to just anyone.
How often should a database be backed up?
It depends on how often the data changes. For an active e-shop, automatic daily backups make sense so you lose as little as possible in case of an outage. It is always good to keep a backup off the main server as well.