Meaning of the word "be effective" in English

What does "be effective" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

be effective

US /bi əˈfɛktɪv/
UK /bi əˈfɛktɪv/

Phrase

to produce a desired result or have a strong impact

Example:
For the treatment to be effective, you must follow the doctor's instructions carefully.
The new marketing strategy proved to be effective in increasing sales.