What is it to remember? When can we say that a subject remembers an event from the past? These are two central questions in philosophy of memory, an area that has witnessed a rapid expansion in the past few years. For almost fifty years, the causal theory of memory, initially proposed by Martin and Deutscher (1966), dominated the attempts to answer the two initial questions. More recently, however, the causal theory has been widely criticized, which has motivated philosophers to develop two new theories of the nature of remembering: the simulation theory and the functionalist theory. In this paper, we discuss these three theories in more detail with the goal of clarifying their commitments, as well as their motivations and problems.What is it to remember? When can we say that a subject remembers an event from the past? These are two central questions in philosophy of memory, an area that has witnessed a rapid expansion in the past few years. For almost fifty years, the causal theory of memory, initially proposed by Martin and Deutscher (1966), dominated the attempts to answer the two initial questions. More recently, however, the causal theory has been widely criticized, which has motivated philosophers to develop two new theories of the nature of remembering: the simulation theory and the functionalist theory. In this paper, we discuss these three theories in more detail with the goal of clarifying their commitments, as well as their motivations and problems.What is it to remember? When can we say that a subject remembers an event from the past? These are two central questions in philosophy of memory, an area that has witnessed a rapid expansion in the past few years. For almost fifty years, the causal theory of memory, initially proposed by Martin and Deutscher (1966), dominated the attempts to answer the two initial questions. More recently, however, the causal theory has been widely criticized, which has motivated philosophers to develop two new theories of the nature of remembering: the simulation theory and the functionalist theory. In this paper, we discuss these three theories in more detail with the goal of clarifying their commitments, as well as their motivations and problems.What is it to remember? When can we say that a subject remembers an event from the past? These are two central questions in philosophy of memory, an area that has witnessed a rapid expansion in the past few years. For almost fifty years, the causal theory of memory, initially proposed by Martin and Deutscher (1966), dominated the attempts to answer the two initial questions. More recently, however, the causal theory has been widely criticized, which has motivated philosophers to develop two new theories of the nature of remembering: the simulation theory and the functionalist theory. In this paper, we discuss these three theories in more detail with the goal of clarifying their commitments, as well as their motivations and problems.What is it to remember? When can we say that a subject remembers an event from the past? These are two central questions in philosophy of memory, an area that has witnessed a rapid expansion in the past few years. For almost fifty years, the causal theory of memory, initially proposed by Martin and Deutscher (1966), dominated the attempts to answer the two initial questions. More recently, however, the causal theory has been widely criticized, which has motivated philosophers to develop two new theories of the nature of remembering: the simulation theory and the functionalist theory. In this paper, we discuss these three theories in more detail with the goal of clarifying their commitments, as well as their motivations and problems.O que é o lembrar? Quando podemos dizer que um sujeito lembra um evento do passado? Essas são duas questões centrais na filosofia da memória, uma área que vem experimentando uma rápida expansão nos últimos anos. Por quase meio século, a teoria causal da memória, inicialmente proposta por Martin e Deutscher (1966), dominou o debate sobre como devemos responder às duas questões iniciais. Mais recentemente, no entanto, a teoria causal se tornou alvo de duras críticas, o que motivou os filósofos da memória a desenvolverem duas novas teorias sobre o lembrar: a teoria simulacionista e a teoria funcionalista. Neste artigo, exploramos essas teorias em mais detalhes com o objetivo de tornar mais claro quais são seus comprometimentos, assim como suas vantagens e desvantagens.