44-45 - Retail trade
"This sector comprises establishments primarily engaged in retailing merchandise, generally without transformation, and rendering services incidental to the sale of merchandise.
The retailing process is the final step in the distribution of merchandise; retailers are therefore organized to sell merchandise in small quantities to the general public. This sector comprises two main types of retailers, store and non-store retailers. Their main characteristics are described below."
More details regarding the description of this sector can be found at the source.