A system for preparing a liquid beverage from a capsule, said system comprising a device, the latter including: - a feeding unit for feeding injection fluid into the capsule, wherein said liquid is provided by a pump of the device; - a control unit for controlling at least the pump of the device; - decoding means communicatively connected to the control unit and designed to read information from encoding means; - said system further comprising a capsule holder and a capsule comprising an inlet surface, said capsule holder being configured to so as to receive and support the capsule; - said capsule being configured to be housed in the capsule holder, said inlet surface being arranged for receiving injection liquid from the feeding unit; - said feeding unit comprising an injection needle for supplying the injection fluid as a jet, said injection needle being able to move relative to the capsule holder from a rest position to an operating position; - said capsule holder being detachable from the feeding unit and movable from an operating position in the feeding unit to a rest position outside the feeding unit; - said feeding unit comprising insertion means which permits the insertion of the capsule holder from its detached position into its operating position in the feeding unit, said insertion means comprises ribs (12a, 12b) which are associated with guide grooves which are wedge-shaped; - said capsule holder comprising complementary insertion means configured to permit the insertion of the capsule holder from its rest position into its operating position in the feeding unit, said complementary insertion means being complementary to the insertion means of the feeding unit, the complementary insertion means of the capsule holder preferably comprising ribs associated with guide grooves, the complementary insertion means preferably being wedge-shaped, substantially linear guides means, said system further comprising the features from the group consisting of: - said capsule being configured so as to position its inlet surface when it is housed in the capsule holder in the operating position in a horizontal position; and - said capsule being configured so as to position its inlet surface when it is housed in the capsule holder in the operating position at a position in which the inlet surface is free from contact with the injection needle when the latter is in the operating position, characterized in that, the capsule inlet surface is concave and comprises one or a plurality of holes. - a feeding unit for feeding injection fluid into the capsule, wherein said liquid is provided by a pump of the device; - a control unit for controlling at least the pump of the device; - decoding means communicatively connected to the control unit and designed to read information from encoding means; - said system further comprising a capsule holder and a capsule comprising an inlet surface, said capsule holder being configured to so as to receive and support the capsule; - said capsule being configured to be housed in the capsule holder, said inlet surface being arranged for receiving injection liquid from the feeding unit; - said feeding unit comprising an injection needle for supplying the injection fluid as a jet, said injection needle being able to move relative to the capsule holder from a rest position to an operating position; - said capsule holder being detachable from the feeding unit and movable from an operating position in the feeding unit to a rest position outside the feeding unit; - said feeding unit comprising insertion means which permits the insertion of the capsule holder from its detached position into its operating position in the feeding unit, said insertion means comprises ribs (12a, 12b) which are associated with guide grooves which are wedge-shaped; - said capsule holder comprising complementary insertion means configured to permit the insertion of the capsule holder from its rest position into its operating position in the feeding unit, said complementary insertion means being complementary to the insertion means of the feeding unit, the complementary insertion means of the capsule holder preferably comprising ribs associated with guide grooves, the complementary insertion means preferably being wedge-shaped, substantially linear guides means, said system further comprising the features from the group consisting of: - said capsule being configured so as to position its inlet surface when it is housed in the capsule holder in the operating position in a horizontal position; and - said capsule being configured so as to position its inlet surface when it is housed in the capsule holder in the operating position at a position in which the inlet surface is free from contact with the injection needle when the latter is in the operating position, characterized in that, the capsule inlet surface is concave and comprises one or a plurality of holes. - said capsule being configured so as to position its inlet surface when it is housed in the capsule holder in the operating position in a horizontal position; and - said capsule being configured so as to position its inlet surface when it is housed in the capsule holder in the operating position at a position in which the inlet surface is free from contact with the injection needle when the latter is in the operating position, characterized in that, the capsule inlet surface is concave and comprises one or a plurality of holes.