Paid sick leave has multiple uses, but most commonly, it allows workers to stay home when they are sick without losing needed pay. Employers also may allow paid sick days to be used to care for family members, to receive regular preventive checkups from the doctor, or to allow victims of domestic violence to address their health and safety needs. This policy contributes to longterm health, workplace productivity and minimizes the spread of illness' and the flu in public places.
Generally, under sick leave provisions, an employee is entitled to certain number of days a year as paid leave for health-related issues or they may accrue hours of sick leave according to the number of hours worked. Some policies are pro-rated for part-time employees. Under some sick leave provisions, employees can accumulate leave from year to year.
Sick leave provisions vary by country, state and even industry. Many high-income economies require employers to provide paid sick days upwards of 10 days, including: the United Kingdom, Japan, Germany, the Netherlands, Switzerland, Sweden, Denmark, Finland, the Netherlands and Singapore. The United States has no federal requirements to allow for the sickness and health of its workforce.
Sick leave has its origins in trade union campaigns for its inclusion in industrial agreements. In Australia, it was introduced into "industrial awards" in 1922 
Under the Federal Governments industrial relations legislation (WorkChoices) eligible employees are entitled to:
Paid personal/carer’s leave can be taken:
Up to ten days of paid personal/carer’s leave in any given year can be used as carer’s leave and personal/carer’s leave is cumulative
The Department for Work and Pensions (DWP) specifies that all employees who are sick for a period longer than 4 consecutive days but less than 28 days are eligible to Statutory Sick Pay (SSP) paid by their employer. There are some exceptions including:
If the individual is unable to work due to medical reasons for longer than the 28 days, they may be entitled to Incapacity Benefit.
Receipt of SSP for a period of longer than 7 days is dependent upon a valid Sick Note from a physician being presented to the employer.
National Partnership for Women and Families, Paid Sick Days website
Levin-Epstein, Jodie "Getting Punched: The Job and Family Clock" Center for Law and Social Policy, July 2006.