"Actions" are incredibly useful as they allow you to work with multiple candidates simultaneously. To perform any action you wish to apply to several users, simply mark them beforehand by clicking on the selection checkbox.

Add to job: If you have a job opening and there are candidates in your database who are a good fit for the position, select them by clicking on the selection checkbox and choose the "Add to job" option under actions.

Download CVs: You will likely want to download CVs. You can do this directly from the database. You can download as many as you have marked.

Send email: You can send a personalized email to several people at once. For instance, if you want to include someone in a process and need to communicate with them, just check the boxes next to the candidates you want to contact. Clicking will take you to a menu where you can load pre-made templates or create the message you desire.

Export XLS (Excel): If you want to download profile data in Excel format.

Send to bin: With this option, you can send the previously selected candidate to the trash.

Invite to apply: You can invite the selected candidates to apply directly to job openings.

Label: Now, you can tag multiple candidates with just one click. This allows you to categorize them quickly.

If you want to explore further and avoid confusion, here is a link that explains the differences between the Add to job and Invite to apply actions. At first glance, they may seem quite similar, but there are some aspects to consider when using them.