Not necessarily. Many commercial carpets in Aurora, IL are paired with underlayment, which is typically thinner and therefore not as soft as residential underlayment, but it's not strictly required. The typical Aurora commercial carpet installation method is to use carpet glue to stick down the underlayment and then bond the carpet to it with more glue.
However, it is possible with some types of commercial carpets in Aurora, IL to simply glue the carpet directly to the subfloor. That may be preferable in locations where the carpet surface needs to be very firm, because it makes it easier for wheelchair users or those pushing wheeled items to get around. It also keeps the installation very low-profile, which can be a good thing when transitioning from a different type of low-profile flooring such as vinyl or linoleum because there's a more even transition between the two that reduces the possibility of tripping. On the other hand, including an underlayment provides a cushion that is more comfortable to walk on, and it also helps to absorb wear and tear damage, which extends the lifespan of your commercial carpet.