A data plan is a service provided by mobile carriers that allows users to access the internet on their smartphones or tablets. It typically includes a specific amount of data, measured in gigabytes (GB), that can be used for activities like browsing the web, streaming videos, and using apps. Once the data limit is reached, users may experience slower speeds or incur additional charges. Data plans can vary widely in terms of cost and features. Some plans offer unlimited data, while others have set limits. Users can choose between prepaid and postpaid options, depending on their preferences and budget. Popular carriers like Verizon, AT&T, and T-Mobile offer various data plans to meet different needs.