Originally "bakfiets" in Dutch, literally "box bike" in English (pronounced "BUCK-FEETS"), this bike is structurally similar to the long john but has a wooden or plastic container on the flat bed on the front. This variety is popular for schlepping children and often comes equipped with seats, seat belts, rain covers and other things to increase the comfort of children.
Basically a three-wheeled version of the box bike. Some people prefer the trike because of their stability but usually there's a trade-off with making it harder to make turns and more difficult to negotiate tighter spaces and avoid potholes.
A trailer with a flat bed, a box or special attachments to carry a variety of cargo. Some are really robust and long so that large, awkward cargo can be carried although with some effort if going uphill.
A bike trailer that is outfitted to carry children securely, often with a cover, padding. Some varieties cater to children with special needs.
Cycle trucks have the same overall size of a standard city bike, but they have a smaller front wheel (typically 20″ compared to a 26″ rear), with a front rack affixed to the frame over the wheel.
An electric motor when outfitted on a bike, the bike becomes an "e-bike" or a "pedal-assist" to provide oomph on hills, into the wind, and with large loads.
A bike trailer that only has the base with no walls. There are often ways to attach bungee cords so you can carry large amounts of stuff, such as bins and boxes.
A cargo bike that is partially foldable to help with storage in small spaces.
A quite popular cargo bike with a flat bed in the front that first appearing in the 1920s in Denmark, Sweden, and The Netherlands. It's a long wheelbase bike with two wheels that can carry a lot of weight and can be quite easy to drive once you get used the feel. See more: "long john"
Made popular first by the Xtracycle add-on for mountain bikes, but now has companies making dedicated bikes, this is a bike with an extra long extension behind the seat so that a much longer rack can be installed allowing for a lot more cargo and seats for children or adults. There a variety of long-tails and accessories for different kinds of cargo.
A bike specially built for taxiing people.
A cargo bike set up to accommodate people with special needs, either older children or elderly adults.
A bicycle that can carry two+ people--adults or children. Some varieties cater to children or adults with special needs that need more support.
Any bike that is built to carry things or people. It has practical features like baskets/racks, fenders and places where child seats can be mounted.