Apple designed the iOS platform with security at its core. When we set out to create the
best possible mobile platform, we drew from decades of experience to build an entirely
new architecture. We thought about the security hazards of the desktop environment,
and established a new approach to security in the design of iOS. We developed and
incorporated innovative features that tighten mobile security and protect the entire
system by default. As a result, iOS is a major leap forward in security for mobile devices.
more here...........https://www.apple.com/privacy/docs/iOS_Security_Guide_Oct_2014.pdf
best possible mobile platform, we drew from decades of experience to build an entirely
new architecture. We thought about the security hazards of the desktop environment,
and established a new approach to security in the design of iOS. We developed and
incorporated innovative features that tighten mobile security and protect the entire
system by default. As a result, iOS is a major leap forward in security for mobile devices.
more here...........https://www.apple.com/privacy/docs/iOS_Security_Guide_Oct_2014.pdf