El título está subrayado.

Spanish often uses estar + past participle to describe the resulting state of something.

So El título está subrayado means the title is in an underlined state.

• estar = to be, in a state or condition
• subrayado = underlined

If you used es subrayado, it would sound unnatural here. Spanish normally prefers estar when talking about how something looks or has been left after an action.

Subrayado is the past participle of the verb subrayar, which means to underline.

• subrayar = to underline
• subrayado = underlined

In this sentence, subrayado works like an adjective describing el título.

Because it agrees with título, which is masculine singular.

Spanish adjectives and past participles used adjectivally usually agree in gender and number with the noun they describe:

• el título está subrayado = masculine singular
• la palabra está subrayada = feminine singular
• los títulos están subrayados = masculine plural
• las palabras están subrayadas = feminine plural

In Spanish, nouns usually need an article more often than in English.

So Spanish says:

• El título está subrayado.

where English might simply say:

• The title is underlined.

Using el is completely normal here because you are referring to a specific title.

The accent mark shows where the stress goes: TÍ-tu-lo.

Without the accent, Spanish stress rules would make you pronounce it differently. The written accent tells you clearly that the stress is on the first syllable.

So:

• título = TÍ-tu-lo

This is very important in Spanish spelling and pronunciation.

Está has a written accent to distinguish it from esta.

• está = is
• esta = this (feminine)

Examples:

• El título está subrayado. = The title is underlined.
• Esta página... = This page...

So the accent helps show that está is the verb form.

Not exactly in the same way as English is underlined can be understood.

In Spanish, estar + past participle usually describes a state, not the action itself. It focuses on the result:

• El título está subrayado. = The title is underlined / The title has been left underlined.

If you want a more clearly action-focused passive, Spanish can use:

• El título fue subrayado. = The title was underlined.
• El título ha sido subrayado. = The title has been underlined.

But in everyday Spanish, está subrayado is very natural when you care about the condition of the title now.

Usually subrayado specifically means underlined.

If you want highlighted with a marker, Spanish more often uses:

• resaltado
• sometimes marcado, depending on context

So subrayado is the best match for a line drawn underneath words.

The order is very straightforward:

• El título = the subject
• está = is
• subrayado = underlined

So it follows a simple pattern:

subject + estar + adjective/past participle

This is one of the most common sentence patterns in Spanish.

You change both the noun phrase and the verb/adjective agreement:

• El título está subrayado. = The title is underlined.
• Los títulos están subrayados. = The titles are underlined.

Notice the changes:

• el → los
• título → títulos
• está → están
• subrayado → subrayados

Everything has to match the plural noun.