In Salesforce Marketing Cloud, Data Views are system data extensions that store essential tracking and sending data for various activities within the platform. These Data Views are useful for retrieving information and generating reports related to different aspects of your email marketing campaigns and subscriber interactions. You can access Data Views using SQL queries in Automation Studio or Query Studio.

Here are some common Data Views in Salesforce Marketing Cloud:

1. _Subscribers: This Data View contains subscriber information, including email addresses, subscriber keys, and subscription status.

2. _Click: It stores data related to subscriber clicks on links in your emails, including the link URL, subscriber details, and timestamp.

3. _Open: This Data View holds information about email opens, such as the subscriber details, email ID, and timestamp.

4. _Sent: It contains data related to sent emails, including the subscriber details, email ID, and timestamp.

5. _Bounce: This Data View stores information about email bounces, including the type of bounce and the subscriber details.

6. _Unsubscribe: It holds data about subscribers who have unsubscribed from your email list, including the reason for unsubscribing and subscriber details.

7. _Journey: This Data View contains information about the interactions and statuses of subscribers within a Marketing Cloud Journey.

8. _ListSubscribers: It provides data on subscriber status and details within a specific list.

These are just a few examples of the Data Views available in Salesforce Marketing Cloud. Data Views allow you to perform various data analyses, track email performance, and gain insights into your subscriber engagement. When querying Data Views, remember to use the correct naming conventions, as Data Views are preceded by an underscore (e.g., _Subscribers, _Click, etc.). Always ensure that you comply with data privacy regulations and best practices when accessing and using subscriber data.