If you want to visit the country for tourism or business purpose you would be required to avail a tourist visa or business visa.
As a tourist, if an applicant belongs to any one of Japan's visa-exempt nations, then he/she is eligible to stay in Japan anywhere from 3 to 6 months without a visa. However, if the applicant's home country doesn't have any visa exemption contract with Japan, he/she will have to apply for a tourist/temporary visitor visa.
A Japan business visa is designed for applicants who want to visit Japan for the purpose of business. This type of visa is granted for a maximum of 90 days and is intended only for market research, business negotiations, conferences, etc.