Rigid bike forks - those that do not have suspension - are found most commonly on road and cross bikes. Upgrading the fork on your bike can make a significant difference to the way it feels whilst out riding. Carbon rigid bike forks can lighten up the front end, increasing the comfort and improving the handling when descending long hills. There are many types of forks available from superlight ones with full carbon steerers, to those that have pannier and mudguard mounts for winter riding. Cyclocross bike forks have clearance for much larger tyres for riding on all surfaces.
Items 1-3 of 3