Which SQL Server version is known for being cost-effective and suitable for lightweight applications?

SQL Server Express is a free, lightweight, and feature-limited version of SQL Server, making it particularly suited for small-scale applications and learning environments. It is designed for developers who need a cost-effective solution for building desktop and small web applications. Its limitations, such as a maximum database size of 10 GB and the absence of some advanced features found in higher-tier editions, position it perfectly for lightweight applications and smaller workloads.

This version enables developers and learners to utilize SQL Server functionalities without incurring licensing costs while allowing the development of applications that can be later scaled up to other SQL Server editions if necessary. The accessibility and ease of use make it an attractive choice for those looking to get started with SQL Server or develop smaller applications without significant financial investment.