There are five main types of employment in the Philippines according to the document:
1. Regular/permanent employment is for employees who perform activities necessary for the employer's business and enjoy security of tenure.
2. Term/fixed employment is for a definite period of time determined by the employment contract.
3. Project employment is for a specific project and the employee may become regular if continuously rehired for new projects.
4. Seasonal employment is for work that occurs only during certain seasons of the year.
5. Casual employment is for incidental work for a definite period and the employee may become regular after one year of continuous service.