General absolution is one of the forms of the sacrament of Reconciliation. However, it is to be used only in rare circumstances.
Per the
USCCB web site the three forms for Reconciliation are:
The Rite for the Reconciliation of Individual Penitents—“The first [form] is the reconciliation of an individual . . . with a new emphasis on the demand for personal dispositions and on the relationship to the word of God. . . . This form of reconciliation is the accustomed one, but enriched by a greater awareness, seriousness, listening, and so to speak, by a new outpouring of divine love and our own inexpressible joy in the knowledge of being restored to divine life. . . .”
The Rite for the Reconciliation of Several Penitents—“The second way of reconciliation is that of a communal preparation followed by individual confession and absolution. It combines the two values of being a community act and a personal act. It is a preferable form of reconciliation for our people when it is possible but it usually presupposes the presence of many ministers of the sacrament and this is not always easy.”
The Rite for the Reconciliation of Several Penitents with General Absolution—“Then there is the third way, a collective form of reconciliation with a single, general absolution. This form, however, is by way of exception, of necessity, in cases sanctioned by the bishops, and with the continuing obligation of individual [confession] of grave sins, that is, mortal sins, at a later time.”
The first form is what I think of as the traditional form. You go as an individual to a priest for confession.
The second form is a communal reconciliation service. Many people come together to pray before confessing their sins individually.
The third form is general absolution. You’ll note that it says it is 'by way of exception, of necessity, in cases sanctioned by the bishops…" The same document goes on to say this about general absolution:
Such absolution is in fact “exceptional in character” and “cannot be imparted in a general manner unless: (1) the danger of death is imminent and there is not time for the priest or priests to hear the confessions of the individual penitents; [or] (2) a grave necessity exists, that is, when in light of the number of penitents a supply of confessors is not readily available to hear the confessions of individuals in an appropriate way within an appropriate time, so that the penitents would be deprived of sacramental grace or Holy Communion for a long time through no fault of their own; it is not considered sufficient necessity if confessors cannot be readily available only because of the great number of penitents, as can occur on the occasion of some great feast or pilgrimage” (Code of Canon Law [CIC], c. 961 §1).10
Also note in the first quote above, that after general absolution there is a “continuing obligation of individual [confession] of grave sins, that is, mortal sins, at a later time.”