Active Record is the Object-Relational Mapping (ORM) layer provided by Ruby on Rails. It facilitates the interaction between Ruby objects and a relational database. It helps us interact with our database using Ruby instead of writing SQL queries directly.

Key features of ActiveRecord include:

• Model Definition: ActiveRecord allows developers to define models that represent database tables. These models inherit from the ActiveRecord::Base class and include methods for defining associations, validations, and callbacks. • CRUD Operations: ActiveRecord provides methods for performing CRUD (Create, Read, Update, Delete) operations on database records. These methods allow developers to manipulate records using Ruby syntax without writing explicit SQL queries. • Associations: ActiveRecord simplifies the definition and management of associations between models. It supports various types of associations, including belongs_to, has_many, has_one, and has_and_belongs_to_many, allowing us to express complex relationships between database tables. • Validations: ActiveRecord includes a robust validation framework for ensuring data integrity. We can define validation rules such as presence, uniqueness, length, format, and custom validations to enforce data constraints at the model level. #orm #rails