What are the differences between Pig and SQL?

Pig is a high-level programming language and platform for data analysis, commonly used to handle structured data. It is a language for building data flow and can be used to execute ETL (Extract-Transform-Load) operations, data cleaning, data transformation, and other tasks. Pig is designed to allow users to express complex data processing logic with simple syntax.

SQL (Structured Query Language) is a standardized language used for managing relational databases, to query and manipulate data within the database. SQL is a declarative language, in which users only need to describe the data they want to retrieve, without concerning themselves with how to retrieve that data.

Therefore, the main difference between Pig and SQL lies in their usage and syntax. Pig is primarily used for data processing and analysis, offering more flexibility and control, while SQL is mainly used for querying and manipulating data within relational databases.