There is a category of physical store aptly named convenience stores. Many countries have 7 Elevens. In Indonesia we have Indomaret, Alfamart and Circle K.
Indonesians might call a shop that sells everything at a low price convenient. However, the prices in convenience stores like Circle K can be quite a lot higher than average. These shops inflate prices precisely so that they can offer the following conveniences:
These are all features that most people would consider convenient. In English if something saves you time and effort then it is convenient.
The following are NOT conveniences:
For your convenience, here are some definitions of 'convenience', as well as some pictures of convenient things.