Difference between Leave Without Pay and Being Absent
Yes, there is a whole world of difference between the two forms of absenteeism. Of course, both are 'Without pay,' but money is not the criterion. The culture, discipline, and attitude are what matter in between.
First, LOP = Leave Without Pay is an authorized leave when there are not enough days available to the credit of the employee's leave account, and the employee has to go on leave due to compelling circumstances like sickness, social reasons such as marriage, other functions, and sometimes even for completing a leftover degree course. This kind of LOP is rarely "applied & approved" as a special case.
Secondly, this LOP is availed with the consent of the management, hence no ambiguity on either side. Third, there is certainty that on the expiry of LOP, the employee concerned will rejoin duty. Fourth, in availing LOP, there is no threat of 'indiscipline.'
On the other hand, 'Absent' errs on all the above four counts and hence is not taken lightly and should not be encouraged at all. Moreover, fifth, in the case of LOP, there is a possibility that these leave days can be reckoned for determining 'continuity of service' without 'a break in service' (subject to the discretion of management) for all purposes, not only for the payment of gratuity but also for determining 'seniority,' grant of increment, etc.
Consequences of Habitual Absenteeism
Absenteeism, when it occasionally 'happens' in intrusive circumstances, may be exonerated with valid and acceptable reasons. But if it is repeated, it becomes 'habitual,' which leads to the initiation of disciplinary proceedings resulting in termination ultimately. It should not be encouraged at all. Therefore, suitable clauses are necessary in the 'terms & conditions' of appointment to safeguard the interest of the employer's commitment and to uphold 'work culture' in the organization.
Employment/workplaces are not bus stations or railway stations to walk in or walk out at will. Where there is no work culture and discipline, that organization's work cannot be carried on.
Leave During Probation
And worse is 'if it happens' during probation. It's true an employee might require a couple of days of leave at any point in time, irrespective of whether during the probationary period or thereafter; unfortunately, leave is 'earned' after rendering one year of uninterrupted service. Maybe some organizations allow/grant a full or part quota of CL to address leave during the first year of entry into service. Probably even EL/PL proportionately for the months served if not the full year, subject to the leave policy permitting such a privilege. I have seen many organizations strictly don't allow leave during probation. Supposing for inevitable reasons leave has to be considered, then there is a possibility of granting a few days leave subject to the condition that the 'probation period' gets extended by those many days of leave applied/granted. This is the solution.
Strict Leave Policy Recommendation
I strongly suggest you should have a strict leave policy to deal with 'habitual absenteeism,' not reporting to work without intimation. This calls for 'capital punishment' such as 'break in service,' deferment of increment, reversal of cadre, etc., in case repeated once. Thereafter, suspension, termination, etc., may follow. Such instances should not be let go without proper inquiry at the department level at least and should be 'rarest of rare.'