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The Difference between "Enquiry" and "Inquiry"
"Inquiry" and "enquiry" are interchangeable in the US, but "inquiry" dominates to the extent that many American readers will consider "enquiry" to be a spelling mistake.

In the UK, "inquiry" and "enquiry" are also interchangeable. However, the following distinction is emerging:

Inquiry. "Inquiry" is used for a formal investigation. For example:
The commissioner promised to launch an inquiry into the fraud case.
Enquiry. "Enquiry" is used for a standard question. For example:
I have received an enquiry about your daughter's situation.

enquire or inquire?

The Difference between "Enquiry" and "Inquiry"
"Inquiry" and "enquiry" are interchangeable in the US, but "inquiry" dominates to the extent that many American readers will consider "enquiry" to be a spelling mistake.

In the UK, "inquiry" and "enquiry" are also interchangeable. However, the following distinction is emerging:

Inquiry. "Inquiry" is used for a formal investigation. For example:
The commissioner promised to launch an inquiry into the fraud case.
Enquiry. "Enquiry" is used for a standard question. For example:
I have received an enquiry about your daughter's situation.

enquire or inquire?