An ORM (object-relational mapper) is a library that maps database tables to objects in application code. Developers can read and write data with their programming language instead of writing raw SQL for every query.
A backend developer builds the server-side systems that store data, apply business rules and serve applications through APIs. Hiring one is how a team secures correctness, security and room to grow in the layer users never see.
Database indexing is the practice of creating data structures that let a database find rows quickly without scanning a whole table. It speeds up reads at the cost of extra storage and slower writes.
SQL (Structured Query Language) is the standard language for defining, querying and changing data in relational databases. It is used to filter, join, aggregate and update rows stored in tables.
The difference is the data model: SQL databases keep related tables under a fixed schema, and NoSQL databases use flexible documents, key-value pairs or graphs. SQL is strongest at joins and transactions; NoSQL often scales out more easily.
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