• Data reference period
• Place of residence (Portugal)

• RESIDENT POPULATION:  The persons who regardless of the fact that at the moment of observation ' 0:00 a.m. of the reference day ' are present or absent in a given housing unit, this unit being where they live during most of the year with their family, or where they have all or most of their belongings.
• E-COMMERCE:  Orders received or placed on a webpage through an extranet or other application using the internet as a platform, such as EDI(by internet), Minitel (by internet) or another network application, irrespective of the device providing the access (e.g. by mobile phone, television, etc.).Payment and final delivery of the goods or services may be made on-line or off-line. In addition to all the internet transactions mentioned above, it also includes orders received or placed by EDI or any other on-line application using automated transactions (e.g. Minitel, interactive phone systems). Orders received or placed by fax or phone are not included.
• REFERENCE PERIOD:  Period to which the information refers and which may be a specific day or a time interval (month, fiscal year, calendar year, among others).

(Persons aged between 16 and 74 years old using e-commerce for private purposes in the first 3 months of the year/ Resident population aged between 16 and 74 years old)*100