Network security solutions are the tools, policies, and services that protect the integrity, confidentiality, and availability of your network and everything connected to it. That includes servers, laptops, mobile devices, cloud workloads, and the data moving between them.
No single product does all of this. Effective protection is layered: if one control fails, another catches the threat. This approach is often called defense in depth, and it sits at the core of any mature cyber security program.