 This section attempts to explain the general idea of human rights by identifying four defining features. The goal is to answer the question of what human rights are with a description of the core concept rather than a list of specific rights. Two people can have the same general idea of human rights even though they disagree about which rights belong on a list of such rights and even about whether universal moral rights exist. The four-part explanation below attempts to cover all kinds of human rights including both moral and legal human rights and both old and new human rights (e.g., both Lockean natural rights and contemporary human rights). The explanation anticipates, however, that particular kinds of human rights will have additional features. Starting with this general concept does not commit us to treating all kinds of human rights in a single unified theory (see Buchanan 2013 for an argument that we should not attempt to theorize together universal moral rights and international legal human rights).