Fundamentals

Privacy: What It Is and Why It Matters

By Daniel Sardá · Published on October 05, 2026

5 min read1,034 words

Privacy protects a sphere of personal discretion and decision-making. Understanding it requires distinguishing it from secrecy, anonymity, and data protection.

A personal conversation can cease to be private when someone forwards it without permission, even if it contains no major secret. The issue is not only what was said: it also matters who was entitled to hear it, why it was shared, and whether the person retained any control over its circulation.

Privacy can be understood as the sphere of life, decisions, and information in which a person can reasonably expect discretion or control over others' access. This is a useful synthesis, not a universal legal definition. The concept encompasses the body, the home, communications, relationships, personal data, and certain decisions that require room free from undue interference.

Privacy therefore does not mean total isolation or a right to hide everything. It means that access to a person should not be entirely at the disposal of others—whether private individuals, companies, or public authorities—simply because that access is possible.

Key idea: Privacy is not only about concealing information; it also lets us decide who may enter certain areas of our lives, for what purpose, and under what conditions.

Privacy, intimacy, and personal data are not the same

These terms overlap, but separating them helps clarify what each protects. Their boundaries vary across languages and legal systems, so the following distinction is educational rather than a taxonomy valid in every country.

Intimacy often refers to the most personal core of life: the body, affections, sexuality, health, or deeply held convictions. Privacy is broader. It can also include an ordinary conversation, consumer habits, movements, or decisions that are not intimate in the strict sense but whose observation and combination give others considerable power. The right to intimacy helps explain this especially sensitive core.

Personal-data protection, in turn, concerns the processing of information connected to identified or identifiable people. Its rules can protect informational privacy, but privacy does not end with a database: it also concerns the home, communications, and the freedom to make certain decisions without constant oversight.

Nor is it synonymous with anonymity. A physician may know a patient's identity while still preserving the confidentiality of the consultation. Conversely, an anonymous account may be traced through other data and exposed to detailed observation. Anonymity prevents or makes identification harder; privacy limits access and interference in a particular context.

Why privacy sustains freedom

Privacy creates room to think, test ideas, change one's mind, and maintain relationships without turning every gesture into a public performance. That room matters for autonomy: a decision is less free when made under permanent observation or in anticipation of disproportionate consequences.

It also makes association possible. People need spaces of trust to talk, organize, seek advice, or explore minority convictions. Not every form of discretion conceals wrongdoing. It often protects ordinary activities from hasty judgment, discrimination, or the use of information out of context.

From a liberal perspective, this sphere works as a limit on power. Those who collect information can classify people, condition opportunities, or anticipate conduct. Individual rights therefore call not only for restraints on direct intervention, but also for predictable rules and accountability mechanisms for those who collect or disclose personal information.

Privacy also has international recognition. Article 12 of the Universal Declaration of Human Rights and Article 17 of the International Covenant on Civil and Political Rights protect against arbitrary interference with private life, family, home, and correspondence, as well as attacks on honour and reputation.

Key idea: Saying “I have nothing to hide” confuses privacy with impunity. Discretion also protects legitimate relationships, personal deliberation, and limits on concentrated power.

The digital environment expands the problem

Technology did not invent privacy, but it multiplied the scale of access. A purchase history that seems trivial can be combined with locations, searches, and contacts to build profiles. The potential harm does not necessarily come from one isolated piece of data, but from its accumulation, inference, retention, and reuse.

This is why a strong password or a consent box does not solve the whole problem. The OECD Privacy Guidelines offer a broader guiding framework: limit collection, specify purpose, safeguard data quality and security, restrict uses, act transparently, and remain accountable. They are international principles, not a directly enforceable worldwide law.

Consent also depends on context. Agreeing that a retailer may process an address to deliver an order is not the same as authorizing every later use. To assess whether there is a meaningful choice, one must consider what information the person received, what alternatives were available, and whether the purpose and scope of processing are proportionate.

Privacy has limits, but it does not disappear whenever another interest is invoked

Privacy is not absolute. It may come into tension with freedom of information, public transparency, criminal investigations, or the protection of others. A targeted investigation subject to safeguards does not pose the same problem as indiscriminate monitoring. Likewise, the public interest in information is not the same as the public's curiosity.

The mere existence of a law does not end the discussion. In its General Comment No. 16, the UN Human Rights Committee explained that interference provided for by law may still be arbitrary and must be reasonable in the particular circumstances. The assessment requires more than invoking security, efficiency, or consent.

No single formula resolves every conflict. But some questions allow for a more rigorous examination:

• Who has access to the person or to their information?
• What specific purpose justifies that access?
• Did the person give informed consent with real alternatives?
• Is more information collected and retained than necessary?
• What power does the person who controls those data acquire?
• Are there limits, oversight, ways to correct errors, and remedies for abuse?

Practical standard: The more sensitive the sphere affected and the greater the power created by access, the clearer the justification and the stronger the safeguards should be.

Privacy protects the possibility of living without every experience being available for other people's purposes. Defending it reasonably does not require absolute secrecy, but understandable limits: justified access, a defined purpose, proportionate scope, and accountability. These standards make it possible to recognize both legitimate uses of information and interferences that turn a person into a permanent object of observation.