Is the maps API free?

I'm curious to know if the maps API offered by this service is free to use or if there are any associated costs? It's important for me to factor in the expenses when deciding on the best solution for my project. Could you please clarify if there are any fees involved in utilizing this maps API, and if so, what those fees might be? Additionally, are there any limitations or restrictions I should be aware of when using this API for my application?