LWF stands for Labour Welfare Fund. It is a succour for those in need in the form of the money or other necessary needy items. Major role of LWF is towards improving social security and working conditions.
In LWF both the employer and the employee contribute, but most of the time employer contribute to the LWF before rolling out the salaries for the employee. This means employees get salaries after deduction for LWF.
Rules for labour welfare fund varies across the different states. If the company has offices and workforce in multiple states then state wise LWF rules are to be followed.
In Zimyo Payroll software you can download LWF report.