Segmented Control is alternative to radio buttons, which is more friendly to touch devices.
It is more visible and encourages to explore provided options.
Significant part of target audience use touch devices
Use it for
View switches (week/month/year or map/list)
Filters
Dos and don'ts
Avoid segment labels longer than one wordUse short segment labels for easy scanningAvoid segment labels with inconsistent widthTry to keep segment label size consistentAvoid adding more than 3 segments.Max number of options _should_ be limited to 3, try to avoid segmented controls to go over two lines.Avoid presenting Segmented control without preselected segmentPreselect first option to communicate how this control works