| Connected product | An item that obtains, generates or collects data about its use or environment and can communicate it through a network, a physical connection or on-device access. Its main function is not storing or processing data for others. |
| Related service | A digital service, including software, linked to the connected product in a way that affects its functions, such as an app that sends commands to the device. Connectivity and power supply are not related services. |
| Product data | Data generated by the use of a connected product that the manufacturer designed to be retrievable by the user, the data holder or a third party, including the manufacturer. |
| Related service data | Data representing user actions or events related to the connected product, generated while the related service is provided. |
| Readily available data | Product data and related service data that the data holder can obtain without disproportionate effort. These are the data covered by the access and sharing obligations. |
| User | The person or company that owns, rents or leases the connected product, or receives the related service. The user has the right to access the data and share it with third parties. |
| Data holder | The entity that has the right or obligation to use and make available the data. Usually the manufacturer or the provider of the related service. |
| Third party | A business chosen by the user to receive the data, such as an independent repair or maintenance provider. It cannot use the data to develop a competing product. |
| Pre-contractual information | The information required by Article 3(2) before a connected product is sold, rented or leased: type, format and volume of data, generation mode, storage and retention, and means of access. Often called the Data Act statement. |
| Placing on the market | The first making available of a connected product on the EU market. It applies to each individual unit, not to the product model. |
| Content | Photos, videos, audio or text recorded by the user, typically covered by intellectual property rights. Excluded from the Data Act access obligations. |
| Derived or inferred data | Data resulting from additional investment, such as proprietary and complex algorithms. Outside the scope of the access obligations unless agreed otherwise. |
| Micro and small enterprise | A company with fewer than 50 employees and up to €10 million in turnover or balance sheet, calculated at group level. Exempt from Chapter II obligations for the products it manufactures or designs. |
| Competent authority | The national authority designated by each Member State to apply and enforce the Data Act. |
| Data coordinator | When a Member State designates more than one competent authority, it appoints one of them as data coordinator, the single point of contact for companies and users. |
| Legal representative | A person or company established in the EU that non-EU manufacturers must designate under Article 37(11). Its location decides which Member State, and so which authorities and data coordinator, oversee the manufacturer. A different role from the CE marking Authorised Representative. |