Databases Explained for Beginners

Databases exist for one reason: data you must not lose.

SQL Databases

Best for:

• Payments and invoices
• Accounting and reports
• User data that must be consistent

Why? Strong structure + transactions.

NoSQL Databases

Best for:

• Rapid iteration
• Flexible, changing data
• Early-stage products

Simple Rule

If accuracy matters (money, legal, reporting) → SQL
If speed and flexibility matter → NoSQL

Key Takeaway

Choosing a database is a product decision, not a trend.