Product Information :  UppaBaby Vista

Tandems: always have at least two or more seats in a row.
Twins: always have two seats side by side.
Triplets: always have three seats side by side.
Travel Systems: always includes a car seat and a pushchair. Sometimes it's more included, for example a carry cot.
Duo/Kombi: in this pushchair the baby/child can both sit and lay down.In both duo and kombi you can take off the carrycot/seat from the chassis.
Strollers/Buggies: are easy to use and neatly fold for travelling and storing. These pushchairs have one seat, and are made for sitting.
Forward facing: similar to stroller/buggy, it also has one seat and is made for sitting. This is more robust and not so easy to take with you.
Trailer: a cart you put back on the bike, to transport your child.