It is an unsaid rule in the world of loans that one needs a co-signer to ensure that the student loan gets approved. That said, it does not mean that you would not get loans if you do not have a co-signer to sign on your agreement. There are some lenders in the market who would offer loans to you with you having to worry about the co-signer.
For commercial banks and large finance companies, "loan agreements" are usually not categorized although "loan portfolios" are often broadly characterized into "personal" and "commercial" loans while the "commercial" category is then subdivided into "industrial" and "commercial real estate" loans. "Industrial" loans are those that depend on the cashflow and creditworthiness of the company and the widgets or service that it sells. "Commercial real estate" loans are those that repay loans but that depend on the rental revenues paid by tenants who lease space, usually for extended times. More granular categorizations of loan portfolios exist but these are always variations around the larger themes.
Loan deferment is a special financing alternative that lets borrowers skip a payment without receiving derogatory credit reporting. The option to defer payments is available for most types of loans including mortgage, auto, credit cards, and student loans. Debtors must obtain lender approval and abide by deferment policies.
It is important to note that some banks do report deferred payments as delinquent. Therefore, it is crucial to ask lenders how they report to credit bureaus before entering into a contract. Payments reported as past due can reduce FICO scores. Depending on credit scores, a reduction of ten points can place debtors in a lower credit category; making it difficult to obtain credit in the future.