A PPC agency is a PPC expert. It has a team that understands the nitty-gritty of the pay-per-click ad campaigns. They are well-versed with all the relevant tools and platforms that shall help you maximize your ROI and ROAS while significantly reducing the marketing cost.
If you are a business owner from India specialized in selling certain services, PPC marketing can help you target reach a potential customer based in the United States too. But this can only happen when you hire an expert instead of performing PPC on your own.