90% of people move between devices to complete a goal on PC, Mobile, Smartphone & others. 86% of people use their smartphone while consuming other media. 75% of customers prefer a mobile friendly site. Sites that work across multiple devices are more enjoyable & successful as well.
These are the main parameters to keep customers happy:
paths to purchase and
The 3 main ways of delivering them are
Responsive web design
Source: Google Think Insights