Application of the Profile Matching Method in the Development of E-Commerce Applications in the Sales of Electronic Goods Sinar Makmur shop is one of the shops that do business in the sale of electronic goods, as a store engaged in sales it is necessary to have an online application (e-commerce) to help expand the reach of sales and to overcome consumer doubts in buying online, it is necessary to manufacture consumer support system to assist consumers in making online purchases and be able to determine the right choice of goods. In making a consumer support system for purchasing electronic goods online, the data collection methods used consisted of interviews, field observations, and literature review. System analysis and system design using the diagrams contained in the UML (Unified Modeling Language) and using the Profile matching method. Profile matching is the process of comparing the actual value of an electronic item with the expected value of an electronic item. Based on the results of the development of this e-commerce application so that goods that have a greater value can be obtained between one item and another and items that have a greater value will be recommended to consumers. Based on the results of making a consumer support system for purchasing electronic goods online, it can be concluded that: 1) This application can help consumers obtain information on goods sold and can make purchases of electronic goods online at Sinar Makmur stores. 2) This application can help Sinar Makmur stores including: Can expand the reach of online sales. To facilitate the storage media for sales data, consumer data, and minimize data exchange and data loss. The advantage of this system is that it is able to provide flexibility for the store to determine private data, in the form of determining core and secondary factor values, determining percent values, determining GAP values and also determining rankings. Question: a) Based on the above case, what data and information can Toko Sinar Makmur get from customers? Explain how the data is managed? b) Explain the role of e-commerce in the Sinar Makmur Shop business?