An affidavit is a sworn statement signed by the affiant and witnessed by a barrister/solicitor (not sure which). It is equivilent to testifying in court.
An affidavit can be used in a variety of ways - I needed one recently to change my daughters surname on her passport, (as I had re-registered her birth). Basically it is a document stating facts that you believe to be true and signed in front of a solicitor.
An affidavit is a sworn statement signed by the affiant and witnessed by a barrister/solicitor (not sure which). It is equivilent to testifying in court.