An affidavit is a written
statement from a person which has been sworn to be true (aka an oath).
The affidavit is signed by that person and also a notary public or
other judicial officer that administered the oath. Not often, but possible,
a district judge will ask for an affidavit to be sworn as to your (and/or
the Defendants) account of an event
leading up to the case: the case will be given a date in the future
when the affidavit must be completed, sworn and in the courts possession.
When completing an affidavit you should write your account as it actually
happened (and in plain English, avoid legal jargon). Also avoid making
personal comments about the other party. If you hand write the form,
capitals are favoured by the judge (after all you want the judge to
understand what you have to say).