Can SQL be used without an RDBMS?

I'm curious about using SQL (Structured Query Language) to work with data, but I'm not sure if it's possible to use SQL without an RDBMS (Relational Database Management System). I understand that SQL is designed to work with relational databases, but I'm wondering if there are any alternative ways to use SQL without an RDBMS. if so, what are some examples of how it could be used? Thank you!