LHCb is one of the four large detectors at the LHC, with a special focus on the physics of B hadron decays. Studying the often very rare decays of these particles copiously produced in proton collisions gives insights into a range of topics from CP violation (do you see it in the LHCb logo?), over lepton flavour universality, probes of new physics at very high-mass, up to exotic hadrons. Did you know that LHCb discovered most particles at the LHC of all experiments, 60 already? Here is an overview of all new hadrons found at the LHC:
https://www.nikhef.nl/~pkoppenb/hadrons//Masses.pdf

Among these are tetraquark and pentaquark states – very important discoveries for the study of the strong force.

Given LHCb's focus on B-hadron decays, it also has a very different detector design than CMS and ATLAS. Indeed, most B hadrons are produced in a rather forward direction, which is the reason for the rather asymmetric design. They also have several detectors specifically geared towards particle identification, such that decay modes can be more easily unravelled. Also a peculiarity of LHCb is that the LHC does not collide at full intensity at their interaction region. They collect less data than CMS and ATLAS, to avoid having too many overlapping collisions (pileup) confuse the reconstruction of the particles that are emitted in the detector.

On their public website, you may find a short intro video and explore further:
https://lhcb-outreach.web.cern.ch/