This is a bit of a tricky question because it depends on how we define "compounds" and how we count them. Here's a breakdown:

Elements: Pure substances that cannot be broken down into simpler substances by chemical means. Examples: gold, oxygen, carbon.

Mixtures: Combinations of two or more substances that are not chemically bonded. They can be separated by physical means. Examples: salt water, air, sand and water.

Compounds: Substances formed when two or more elements chemically combine in a fixed ratio. Examples: water (H₂O), carbon dioxide (CO₂), table salt (NaCl).

The problem with counting compounds:

* Infinite possibilities: Theoretically, the number of possible compounds is infinite, given the vast combinations of elements and their possible ratios.

* New discoveries: Scientists are constantly discovering new compounds, both naturally occurring and synthetically created.

* Dynamic nature: The number of compounds in existence is constantly changing due to synthesis, decomposition, and natural processes.

So, there's no single, definitive answer to how many compounds exist. We can say:

* Known compounds: There are millions of known compounds, with new ones being discovered regularly.

* Potential compounds: The potential number of compounds is likely much larger than what we have discovered so far.

Important Note: It's crucial to remember that the number of compounds is not the most important factor when studying chemistry. Understanding the properties, reactions, and structure of compounds is what truly matters.