What is the main diffrence between a personal letter and a professional letter

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A letter is said to be informal when it is written in a friendly manner, to someone you are familiar with. Formal letters are written for official or professional communication. On the other hand, informal letters are used for casual or personal communication. There is a manner prescribed for writing formal letters.

Solution: the categorization of functional and non-functional requirement are as follows: some of the more typical functional requirements include: • business rules• transaction corrections, adjustments and cancellations• administrative functions• authentication• authorization levels• audit tracking• external interfaces• certification requirements• reporting requirements• historical data• legal or regulatory requirementswhile,some typical non-functional requirements are: • performance – for example response time, throughput, utilization, static volumetric• scalability• capacity• availability• reliability• recoverability• maintainability• serviceability• security• regulatory• manageability• environmental• data integrity• usability• interoperability