Això és la realitat.

Because Catalan has two main verbs for to be: ser and estar.

Here, és is from ser, and it is used for:

• identity
• definition
• classification
• permanent or essential description

In Això és la realitat, the sentence identifies something: This is reality.

If you used està, it would sound wrong here, because estar is usually for:

• location
• temporary states
• conditions

So:

• Això és la realitat = correct
• Això està la realitat = not correct

Això is a demonstrative pronoun meaning this or this thing.

It is neuter, which means it does not refer to a specific masculine or feminine noun. Native English speakers often find this useful to think of as:

• this
• this thing
• this matter
• this situation

So in Això és la realitat, això points to some idea, fact, situation, or thing that has just been mentioned or is being shown.

Because això is the neuter form.

Use això when you are referring to:

• an idea
• a whole situation
• something not named with a noun
• something abstract

Use aquest or aquesta when you are referring to a specific noun:

• aquest llibre = this book
• aquesta taula = this table

So:

• Això és la realitat = This is reality
• Aquest és el llibre = This is the book
• Aquesta és la realitat could work only if realitat is already the understood feminine noun being pointed to, but that is a different structure.

A rough pronunciation for an English speaker is:

eye-SHAW ez luh reh-uh-lee-TAT

A few useful notes:

• Això: the x sounds like sh
• és: sounds like ez or ess, depending on context and dialect
• realitat: the stress is on the last syllable, -tat

A more careful pronunciation guide:

• Això → the last syllable is stressed
• realitat → re-a-li-tat

Pronunciation varies a bit by dialect, but this approximation will be understood.

The accent in és helps distinguish it from es, which is a different word.

• és = is
• es = a pronoun, often meaning oneself or used in pronominal verbs

Examples:

• És veritat = It is true
• Es diu Joan = He is called Joan

The accent also shows the stressed vowel. So és is not just decorative; it helps both meaning and pronunciation.

Because Catalan often uses the definite article with nouns, including abstract nouns, more often than English does.

So la realitat is the natural form here:

• Això és la realitat

For an English speaker, it may feel like the reality, but in Catalan this often corresponds simply to reality in English.

Saying Això és realitat would usually sound unnatural or incomplete in standard Catalan.

Yes, realitat is feminine, which is why it takes la:

• la realitat

You often learn the gender of a noun together with its article:

• la realitat
• la ciutat
• la veritat

A useful pattern is that many nouns ending in -tat are feminine in Catalan.

So if you see realitat, it is a good bet that it is feminine.

Yes, you can, but the emphasis changes.

• Això és la realitat = focuses first on this
• La realitat és això = focuses first on reality

Both are grammatical, but they are not used in exactly the same way in context.

For example:

• Això és la realitat = This is reality
• La realitat és això = Reality is this

The second version can sound more emphatic or contrastive, depending on the situation.

They are related, but not the same.

• Això és la realitat = This is reality
• Això és real = This is real

In the first sentence, realitat is a noun. In the second sentence, real is an adjective.

So:

• la realitat = reality
• real = real

The first identifies something as reality itself or the actual state of things. The second describes something as true, genuine, not imaginary.

Yes, but it means something slightly different.

• Això és la realitat = This is reality / This is the reality
• Això és una realitat = This is a reality

Using una makes it sound like:

• one reality among others
• an established fact
• a real situation that exists

So una realitat is possible, but it changes the nuance. In many contexts, la realitat is the more natural choice for the sentence you were given.