A business PC is much the same as a consumer grade PC in terms of appearance. Both types of PC may even have similar specifications. If you plan on buying a PC you need to use for work though, there are some subtle differences you should be aware of.
Generally speaking, business grade PCs are designed for prolonged use over a longer period of time than a consumer or home PC. They are assembled using higher quality, more durable components that can withstand the test of time, better endure heat, humidity and dust and remain consistently productive. The use of a better class of components is reflected in a price premium but should ensure you are investing in a PC with high reliability that will serve you well for years to come