The bill of sale essentially falls into two types:  the conditional bill of sale and the absolute bill of sale.  The absolute bill of sale do not represent security in any form, but just simple documents serving as evidence of assignment, transfer and a form of assurance regarding personal chattels.  These are in substance no more than contracts of sale of merchandise or goods under the common law of obligations and contract and the law on sales.

There are many bill of sale templates online, serving as documents to affirm the agreement made by two parties, with one party selling specific assets or goods and the other buying them.