Definition - What does Application Security mean?
Techopedia explains Application Security
Application security is one of several levels of security that companies use to protect systems. Others include operating system security, network security and end-point or mobile security.
All of these types of security are aimed at protecting clients and users of software from of hacking and malicious intent. In addition, application security is critical for mobile app stores, where hackers try to attach various kinds of malware to less vetted mobile apps.