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 * Technical Security Concept
 * Data Privacy Concept
 
+### Glossary
+For an easier understanding of the used acronyms and special terms in our documents please see our [glossary](glossary.md).
+
 ## Licensing
 
 Copyright (c) 2020 Deutsche Telekom AG and SAP SE or an SAP affiliate company.
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+# Glossary
+
+This overview provides a description for all acronyms and special terms which are used in the Corona-Warn-App repositories. If you encounter any missing terms, please [let us know](https://github.com/corona-warn-app/cwa-documentation/issues/new?labels=documentation%2C+bug&template=01_doc_issue.md) or [create a pull request](https://github.com/corona-warn-app/cwa-documentation/pulls).
+
+| Term, acronym... | Description |
+| --- | --- |
+| AEM | Acronym for "[Associated Encrypted Metadata](https://covid19-static.cdn-apple.com/applications/covid19/current/static/contact-tracing/pdf/ExposureNotification-BluetoothSpecificationv1.2.pdf)". A privacy preserving encrypted metadata that shall be used to carry protocol versioning and transmit (Tx) power for better distance approximation. The Associated Encrypted Metadata changes about every 15 minutes, at the same cadence as the Rolling Proximity Identifier, to prevent wireless tracking of the device.  |
+| API | An [Application Programming Interface](https://en.wikipedia.org/wiki/Application_programming_interface) (API) is a computing interface which defines interactions between multiple software intermediaries. |
+| BGG | The [German Equality of Persons with Disabilities Act](https://www.gesetze-im-internet.de/bgg/), acronym for "Behindertengleichstellungsgesetz", long term: "Gesetz zur Gleichstellung von Menschen mit Behinderungen". |
+| BLE, BTLE | [Bluetooth Low Energy](https://en.wikipedia.org/wiki/Bluetooth_Low_Energy) is a wireless personal area network technology. It is used in the Corona-Warn-App. |
+| BMG | German [Federal Ministry of Health](https://www.bundesgesundheitsministerium.de/en/en.html), acronym for "Bundesministerium für Gesundheit". |
+| CDN | Acronym for [Content Delivery Network](https://en.wikipedia.org/wiki/Content_delivery_network). |
+| COVID-19 | [Coronavirus disease 2019](https://en.wikipedia.org/wiki/Coronavirus_disease_2019) is an infectious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). |
+| CWA | The [Corona-Warn-App](https://github.com/corona-warn-app/cwa-documentation), the official COVID-19 exposure notification app for Germany. |
+| DP-3T | [Decentralized Privacy-Preserving Proximity Tracing](https://github.com/DP-3T/documents), another approach to an exposure notification app, mainly driven by institutions from Switzerland. |
+| FAQ | Frequently Asked Questions |
+| GUID | Acronym for "[Globally Unique Identifier](https://en.wikipedia.org/wiki/Universally_unique_identifier)". |
+| IfSG | The [German Prevention and Control Act of infectious diseases among humans](https://www.gesetze-im-internet.de/ifsg/index.html), acronym for "Infektionsschutzgesetz", long term: "Gesetz zur Verhütung und Bekämpfung von Infektionskrankheiten beim Menschen". | 
+| OTC | Acronym for "[Open Telekom Cloud](https://open-telekom-cloud.com/)"
+| PEPP-PT | [Pan-European Privacy-Preserving Proximity Tracing](https://www.pepp-pt.org/), formerly endorsed approach to a COVID-19 exposure notification app for Germany. | 
+| QR Code | Acronym for [Quick Response Code](https://en.wikipedia.org/wiki/QR_code), a two-dimensional/matrix barcode used in the Corona-Warn-App. | 
+| REST | Acronym for "[Representational State Transfer](https://en.wikipedia.org/wiki/Representational_state_transfer)". |
+| RKI | The [Robert Koch-Institut](https://www.rki.de/) is Germany’s public health institute. |
+| RPI | Acronym for "[Rolling Proximity Identifier](https://covid19-static.cdn-apple.com/applications/covid19/current/static/contact-tracing/pdf/ExposureNotification-BluetoothSpecificationv1.2.pdf)". A privacy preserving identifier derived from the Temporary Exposure Key and sent in the broadcast of the Bluetooth payload. The identifier changes about every 15 minutes to prevent wireless tracking of the device. |
+| SARS-CoV-2 | [Severe acute respiratory syndrome coronavirus 2](https://en.wikipedia.org/wiki/Severe_acute_respiratory_syndrome_coronavirus_2) (SARS-CoV-2) is the strain of coronavirus that causes coronavirus disease 2019 (COVID-19), a respiratory illness. It is colloquially known as coronavirus. |
+| TAN (teleTAN) | Acronym for "[Transaction Authentication Number](https://en.wikipedia.org/wiki/Transaction_authentication_number)", in the context of the Corona-Warn-App it's called the 'teleTAN' and used to verify the upload of diagnosis keys. |
+| TAM | Acronym for "[Technical Architecture Modeling](http://www.fmc-modeling.org/fmc-and-tam)", a modeling language mainly used at SAP to descibe software architectures.
+| TCN | The [TCN Coalition](https://tcn-coalition.org/) is a global community of people to support exposure notification apps during the COVID-19 pandemic. |
+| TEK | Acronym for "[Temporary Exposure Key](https://covid19-static.cdn-apple.com/applications/covid19/current/static/contact-tracing/pdf/ExposureNotification-BluetoothSpecificationv1.2.pdf)". A key that’s generated every 24 hours for privacy consideration. |
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