Jib cranes are often used more flexibly than fixed gantry cranes (though less flexibly than mobile cranes, of course). They will need to use a hoist, often attached to a sling, to lift up loads safely and make sure they are properly balanced. The perfect one will work in conjunction with your jib crane and will lift loads safely, keeping the weight well distributed and making sure they are balanced throughout the lifting process.
Wire rope hoists and chain hoists can both be used with jib cranes. Both are electric hoists rather than manual and will require little manual input from the operator. The operator will instead be there to monitor the lift and make sure it happens safely and as expected, rather than having to do any of the actual physical lifting. Jib crane specifications will dictate which type of sling is best to use, and for which kind of lift.