dbt-utils is a collection of pre-written macros designed to simplify complex SQL logic in Data Build Tool (dbt) projects, offering utilities such as SQL generators, generic tests, Jinja helpers, web macros, and introspective macros. Maintained by dbt Labs with contributions from the broader data community, dbt-utils streamlines data transformations by providing reusable code snippets that help with tasks like pivoting data, generating data spines, and performing generic tests. To integrate dbt-utils into a project, users need to include the package in a `packages.yml` file and run the `dbt deps` command to install dependencies. Examples of its application include using the star macro to select fields while avoiding naming conflicts and the pivot macro to transform rows into columns for A/B test data analysis. Additionally, dbt-utils extends dbt's native testing capabilities with macros like equal_rowcount, ensuring two datasets have the same row count, and not_accepted_values, which verifies that columns do not contain specified unwanted values.