The terms “mold” and “mould” both refer to the same organism, a type of fungus that grows in damp environments. The primary difference between the two terms lies in their spelling and regional usage. Here’s a detailed breakdown:

Mold vs. Mould: The Difference

1. Mold (American English):

   • Definition: Mold refers to any fungal growth that develops in damp or decaying organic matter, commonly found on food, walls, or other surfaces.
   • Usage: “Mold” is the preferred spelling in American English. It is used in the U.S. and other countries that follow American English conventions.
   • Example: “There is mold growing on the bread.”

2. Mould (British English):

   • Definition: Mould refers to the same type of fungal growth as “mold.” It is used to describe the same organism or condition in other regions, particularly in the UK.
   • Usage: “Mould” is the preferred spelling in British English, as well as in regions influenced by British spelling conventions (like Australia, Canada, and New Zealand).
   • Example: “The walls in the bathroom have mould on them.”

Scientific Perspective

Despite the different spellings, there is no difference in meaning or scientific understanding. Both terms refer to fungi from the Kingdom Fungi, particularly from the Ascomycota and Basidiomycota divisions, that thrive in moist environments.

Regional Preference:

• Mold: Used in the United States, Canada, and other countries that follow American English. However, in U.A.E, Mold is commonly used.
• Mould: Used in the United Kingdom, Australia, New Zealand, and other countries that follow British English.

Other Uses of Mold/Mould:

While the terms are most commonly used to refer to the fungus, “mold” or “mould” can also refer to a form or cast used to shape a substance (e.g., “a cake mould” or “a plastic mold”).

The only difference between mold and mould is the regional spelling preference. They both refer to the same fungus and are used interchangeably based on whether you are using American or British English. Therefore, the meaning remains the same no matter which version you use.