Are the Tasks & Activities Modules the same?

Are the Tasks & Activities Modules the same?

Within Zoho documentation and our own CRM account, I feel like the terms "Tasks" and "Activities" are used interchangeably for that Module. So I am confused: Are the Tasks & Activities Modules the same? If not, what is the difference?
  1. In the chart at the top of this page, "Activities" is used. But in the Table of Contents and Body, "Tasks" is used.
  2. In the top of our account, "Activities" is used as the Tab Title. But "+ Task" is used on the button.
  3. In our "Customization > Modules and Fields" section, I am not able to edit "Activities," but I am able to edit "Tasks."
  4. When I click "Organize Modules" in our account, only "Activities" is available.
Thank you in advance for any assistance.