As western society has evolved, it has declared a certain set of freedoms and entitlements to be called rights. The United States' Declaration of Independence proclaimed, "We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness."
As the US government evolved, the Bill of Rights was written, setting out a number of familiar rights: freedoms of speech and assembly, the right ro bear arms, etc.. Further amendments to the constitution have been added since, many of which included some concept of rights. Other western countries have similar concepts reflected in their relative governments: there is the British Bill of Rights of 1689, the German Grundgesetz of 1949, and Title 2 of the Swiss Federal Constitution, among others. Furthermore, the United Nations' International Bill of Human Rights was passed 1948.
When it comes to rights, there is a lot of disagreement. Contemporarily, the LGBTQ community is fighting for the right of same-sex couples to marry in the US, though they are free to so in other countries. China is known for limiting some freedoms we take for granted in the States. Several international human rights organizations condemn North Korea for being brutal to its people. Philosophically, there is a distinction between legal and natural rights, the latter being along the lines of the "unalienable rights" mentioned in the Declaration of Independence. The problem is, like in all things philosophical, there are differing opinions of what natural rights entail, thus countries have varying degrees of freedoms and individuals are proponents of a wide spectrum of diverse sets of rights.
Rights, however, are merely privileges clothed in legal or philosophical disguises--privileges that we should have, for whatever reason. As individuals, we can be aware of the history of these privileges and of the current legal climate, domestically and internationally. We should formulate our own opinions and theories about natural rights. If we see these rights being violated, we can defend them. Rights are privileges that are not necessarily finite--you can't run out of freedom of speech--and so supporting and sharing these privileges can cost very little. And as always, we can be grateful for the privileges we possess.