Which type of advertisement automatically detects its location and expands in multiple directions?

The type of advertisement that automatically detects its location and expands in multiple directions is known as a Multi-directional Expanding (MDE) ad. This format is designed to enhance user engagement by expanding from a compact form into a larger ad that can display additional content, images, or information. The ability of MDE ads to detect their surroundings means they can adjust their size and orientation based on the available space on the screen, providing a more immersive experience for users.

In contrast, other types of advertisements like floating ads or push-down ads have specific functions that do not involve multi-directional expansion based on location detection. Floating ads typically appear above the content, and push-down ads expand downward, but neither adjusts dynamically in multiple directions based on location. Peel-down ads similarly do not possess the capability to expand in multiple directions; they usually reveal additional content when a user interacts with them.

Thus, the MDE ad stands out for its adaptive and interactive nature, making it the correct choice for this question.