What is exactly a joint controller in GDPR? Examples
<p>I am not sure I really understand the concept of "joint controllers" in GDPR, and I'd like to have some concrete examples, especially examples of joint controllers relating to the internet (websites, services, hosting, providers, etc.), if it makes sense for any to exist.</p>

<p>The website of the European commission has <a href="https://ec.europa.eu/info/law/law-topic/data-protection/reform/rules-business-and-organisations/obligations/controller-processor/what-data-controller-or-data-processor_en" rel="nofollow noreferrer">a similar asked question with answer and a small example</a>:</p>

<blockquote>
  <p><strong>Controller and processor</strong></p>
  
  <p>A brewery has many employees. It signs a contract with a payroll
  company to pay the wages. The brewery tells the payroll company when
  the wages should be paid, when an employee leaves or has a pay rise,
  and provides all other details for the salary slip and payment. The
  payroll company provides the IT system and stores the employees’ data.
  The brewery is the data controller and the payroll company is the data
  processor.</p>
  
  <p><strong>Joint controllers</strong></p>
  
  <p>Your company/organisation offers babysitting services via an online
  platform. At the same time your company/organisation has a contract
  with another company allowing you to offer value-added services. Those
  services include the possibility for parents not only to choose the
  babysitter but also to rent games and DVDs that the babysitter can
  bring. Both companies are involved in the technical set-up of the
  website. In that case, the two companies have decided to use the
  platform for both purposes (babysitting services and DVD/games rental)
  and will very often share clients’ names. Therefore, the two companies
  are joint controllers because not only do they agree to offer the
  possibility of ‘combined services’ but they also design and use a
  common platform.</p>
</blockquote>

<hr>

<p>If you want more information on the legal part, here some links to the relevant GDPR Articles:</p>

<ul>
<li>Legal information on joint Controllers you can find in the <a href="https://truendo.com/gdpr/chapter-4/section-1/article-26/" rel="nofollow noreferrer">GDPR Article 26</a>.</li>
<li>The definition of a controller in the <a href="https://truendo.com/gdpr/chapter-1/article-4/" rel="nofollow noreferrer">GDPR Article 4 (7)</a>.</li>
<li>The definition of responsibility of a controller. <a href="https://truendo.com/gdpr/chapter-4/section-1/article-24/" rel="nofollow noreferrer">GDPR Article 24</a></li>
<li>The definition of a processor. <a href="https://truendo.com/gdpr/chapter-4/section-1/article-28/" rel="nofollow noreferrer">GDPR Article 28</a>.</li>
<li>Processing under the authority of the controller or processor. <a href="https://truendo.com/gdpr/chapter-4/section-1/article-29/" rel="nofollow noreferrer">GDPR Article 29</a></li>
</ul>

internet european-union gdpr