The heterogeneous environment created by the Internet of Things might cause several different privacy threats for people because its data collection is very extensive and passive. The data collection is often targeted at the personal information of individuals which can be harmful for their privacy. Companies can take advantage of this information in many areas of their business. In the view of companies, the Internet of Things creates new efficient opportunities to collect and utilize customer data, which can strongly affect the realization of privacy threats. This Bachelor’s thesis examines the privacy threats created by the Internet of Things and customer data from an individual's perspective. The thesis is executed as a literature review using scientific publications on the subject. The privacy threats created by the Internet of Things to individuals are first considered in general, after which these threats are also examined from the perspective of customer data. To understand the perspective of customer data, the data collection and utilization of companies are considered as a part of this thesis.