Ecosystem engineers are organisms that directly or indirectly create, modify or maintain the environment they inhabit. These organisms play a vital role in shaping their ecosystems. There are several synonyms for the term "ecosystem engineer." One of the most commonly used synonyms is "keystone species," which refers to species that have a disproportionately large effect on an ecosystem. Another synonymous term is "ecosystem modifiers," which refers to organisms that affect the structure and function of an ecosystem. "Foundation species" and "landscape architects" are also synonyms for ecosystem engineers as they build, shape and maintain habitats that are favorable for their survival. In short, ecosystem engineers are crucial for maintaining the balance and stability of ecosystems, and their role cannot be underestimated.