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swapnil more answered Taymour Alqudah's question

In cast iron percentage of carbon is greater than 2%, it is hard and brittle. Carbon steel has a maximum of 2% of carbon. It is ductile and easily deform. Ductile iron can be deformed easily. And in this carbon percentage is very less. Examples Steel Crates , Steel Bins

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swapnil more answered Mohammed Masum's question

A firm is a business organization, such as a corporation, limited liability company or partnership, that sells goods or services to make a profit. ... "Firm" is often used interchangeably with "business" or "enterprise."

for example Wedding Choreography Services can provider is measure in firm not TATA mortars