1. Mobile Friendly Applications
Before there were “pads” and smart phones, there was only the desktop
Websites were either:
Resizable
Fixed-width
Fixed width became dominant because it gave designers control of the layout
See the GSP websites

2. “Old” Mobile Devices
To support old devices, we had to write “mobile applications”
Go OS
Palm Pilot
Windows for Pen

3. Current Mobile Devices
iPad, iPhone: iOS
Android
All have Wi-Fi and Cell Phone Internet capability
Can still create applications for:
Desktop web
iOS
Or just create “responsive websites”

4. “Responsive” Websites
Adapt to with width of the device, from large desktop monitors to smart phones
See:
Bootstrap is a CSS library that now dominates web development
See Bootstrap in W3Schools