La photothèque contient la miniature.

Yes. Both photothèque and miniature are feminine singular nouns, so they take the feminine singular definite article la.

• la photothèque = the photo library / image library
• la miniature = the thumbnail

In French, noun gender is grammatical, so you have to learn the gender with the noun.

Photothèque literally means something like photo library, image library, or collection of photographs/images.

It is built like:

• photo = photo
• -thèque = a collection/storage place, like in bibliothèque

So yes, it is similar in structure to bibliothèque:

• bibliothèque = library
• photothèque = photo library / image archive

Depending on context, photothèque could refer to a digital image library, a media library, or an organized photo archive.

Contient means contains. It comes from the verb contenir, which means to contain.

This is the 3rd person singular present tense form:

• je contiens = I contain
• tu contiens = you contain
• il / elle / on contient = he / she / it contains

So in La photothèque contient la miniature, the subject la photothèque is singular, so the verb is contient.

Because French usually does not use a separate subject pronoun when the noun itself is already the subject.

In English, you might say:

• The photo library contains the thumbnail.
• or It contains the thumbnail.

In French, if you keep the noun, you simply say:

• La photothèque contient la miniature.

You only use elle if you replace la photothèque with a pronoun:

• Elle contient la miniature.

Since photothèque is feminine, the pronoun would be elle.

A rough pronunciation guide is:

• La photothèque → la fo-to-tek
• contient → roughly kon-tyan
• la miniature → la mi-nya-tyr

A more precise IPA version is:

• La photothèque contient la miniature.
• /la fɔ.tɔ.tɛk kɔ̃.tjɛ̃ la mi.nja.tyʁ/

A few pronunciation notes:

• ph sounds like f
• th in photothèque is just t, not the English th
• ien in contient is a nasal sound
• the final -e in contient is not pronounced
• the r in miniature is the French r

In French computer and media vocabulary, une miniature is commonly used for a thumbnail image.

The basic idea is the same as in English miniature: something small, reduced, or a small version of something bigger.

So in a digital context:

• une miniature = a thumbnail
• une image miniature can also mean a reduced-size image

Sometimes, yes, depending on context.

Both can refer to a small preview image, but:

• miniature is very common for thumbnail
• vignette can also be used, especially in computing, publishing, or image-display contexts

However, miniature is often the safest direct translation for thumbnail in general user-interface language.

Because this sentence follows the basic normal French word order:

• Subject + Verb + Object

So:

• La photothèque = subject
• contient = verb
• la miniature = direct object

This matches English quite closely:

• The photo library = subject
• contains = verb
• the thumbnail = object

In this sentence, you normally keep the articles la and la.

French uses articles more often than English, and with countable singular nouns like these, leaving out the article would usually sound incorrect.

So you say:

• La photothèque contient la miniature.

Not:

• Photothèque contient miniature.

The definite article is needed because you are talking about a specific library and a specific thumbnail, or about them as identified items in context.

There is no major required liaison here that a beginner must worry about.

You can pronounce the words separately in a natural flow:

• La photothèque / contient / la miniature

One thing to notice is that photothèque ends with a pronounced k sound, and contient begins with k, so you will hear two nearby k sounds:

• photothèque contient

That is normal.

It can refer to both, but in modern usage it often refers to a digital image collection as well.

Depending on context, photothèque may mean:

• a physical photo archive
• an institutional image archive
• a software photo library
• a media/image database

So in a computer or app context, La photothèque contient la miniature is perfectly natural for talking about digital images.

Here, miniature is a noun.

In French, miniature can be:

• a noun: une miniature = a miniature / a thumbnail
• an adjective: un modèle miniature = a miniature model

In this sentence, it is clearly a noun because it is preceded by the article la:

• la miniature

You would make the nouns and verb plural:

• Les photothèques contiennent les miniatures.
• The photo libraries contain the thumbnails.

Changes:

• la → les
• photothèque → photothèques
• contient → contiennent
• la miniature → les miniatures

Note that the ending -ent in contiennent is usually not pronounced.