Academic: In the academic world a letter of intent is known as a Statements of Purpose and is part of the application process. Real estate: Often times there are properties that are not listed on the MLS or with a realtor. It is at these times that a letter of intent can be used to let the owner of the house know that a potential buyer exists and thus the process of buying and selling the house may begin.
It is important that the description for the type of information is specific to what is being confidentially disclosed. As an example a software company working in the field of transportation systems might say; "The information being disclosed is a concept for passing waybills from carrier to carrier using mobile phone technology". This is by far preferential to saying "The information being to disclosed is information relating to software for transportation carriers". Anyone charged with determining whether confidential information is being disclosed is more able to make the assessment when the description is more specific.