What is a joint process, and what is the difference between a by-product and a main product?

Accounting

Joint Product and By–Product Costing

Q1: What is a joint process, and what is the difference between a
by
–product and a main product?
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Q2: How are joint costs allocated?
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Q3: What factors are considered in choosing a joint cost allocation method?
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Q4: What information is relevant for deciding whether to process a joint product beyond the split–off point?
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Q5: What methods are used to account for the sale of by– products?
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Q6: How does a sales mix affect joint cost allocation?
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Q7: How do joint cost allocations affect decisions and managerial incentives?