Your identity should reflect your professionalism and the area you occupy in the public or private sector and enable easy recognition ensuring you stand out from your competitors.
Letterhead, envelopes, and business cards can be incredible tools to promote your company - the sheets of paper called stationery can be designed to inspire questions as to your further product or service base available. Handing a potential new client a business card is a very personal experience and the presentation of the way a logo or text sits on the card can make as much of an impression as if you are smartly dressed.
Don't ignore your Corporate identity as this will have a major impact on your business acumen and without effective corporate indentity or good brand awareness lost sales may well be the outcome.