There is a high demand for IT professionals, with over 300,000 core IT jobs currently open in the US. IT certifications are important for validating skills and making training more effective. Some of the most valuable certifications for getting hired and advancing one's career include the CompTIA A+, Network+, Security+, and various Microsoft and Cisco certifications. Many federal agencies also require or recommend various CompTIA certifications. Certified workers tend to be more productive, solve problems better, and are less likely to change jobs.