What does it means to love a "TV series" nowadays? Or, to use a more pragmatic formulation, what do television series make their viewers do? To answer these questions, this thesis invites the reader to move beyond the paradigm of reception – on which the majority of studies in the field build upon - and explore the remits and contours of the practice of series. The aim is to study the practical activities undertaken by amateurs, how their attachments to the series are built, the ingredients of this attachment, and the material, technical and relational means of this attachment. This work shows that spectators' practices do not stop at the moment of viewing, when the individual is in front of his post, but extends to all activities, times and spaces through which an individual connects to a series. Drawing upon forty in-depth interviews and an examination of the ways in which series are socio-technically mediated, the thesis proposes to follow amateurs in their daily practices, from the viewing and storage of series, to their conversational exchanges, as well as through the procedures of information and discovery, procurement and sharing of content. All these activities are not only "receptive". As the thesis shows, they are at once reflexive, embodied, instrumented and collective, and they reveal the diversity of attachments of the "seriephiles" to these singular objects.