There are 2 different types of Singapore Visa:
1) Tourist Visa
i) This visa is recommended for leisure trips, visits to relatives and/or friends place, technological or scientific conferences, seminars or meetings (services provided must not be paid by organizations/corporations in Singapore, except reimbursement for expenses or per diem allowances)
ii) Tourist visa holders are not allowed to engage in any paid activity in Singapore
iii) The visa processing time is between 5 - 6 working days (excluding Saturdays & Sundays)
2) Business Visa
Business visa is recommended for trips that are commercial in nature and is issued for a specific period of time, i.e. the purpose of your trip is to enter Singapore for a temporary business visit.