Она представляет клиента.

Because клиент is a masculine animate noun.

In Russian, masculine animate nouns take the accusative singular form that looks the same as the genitive singular. So:

• клиент = nominative singular
• клиента = accusative singular (and also genitive singular)

Since клиента is the direct object of представляет, it must be in the accusative:

• Она представляет клиента. = She represents the client.

If the noun were inanimate, the accusative would usually look like the nominative instead.

Представляет is:

• 3rd person singular
• present tense
• imperfective

It matches она, so it means she represents.

The basic pattern is:

• я представляю = I represent
• ты представляешь = you represent
• он / она представляет = he / she represents
• мы представляем = we represent
• вы представляете = you represent
• они представляют = they represent

Yes, Russian can often omit subject pronouns when the subject is clear from the verb form or from context.

So both are possible:

• Она представляет клиента.
• Представляет клиента.

Including она can make the subject clearer or add emphasis/contrast, for example:

• Она представляет клиента, а не коллегу.
  She represents the client, not the colleague.

So она is not always strictly necessary, but it is perfectly natural.

No. Представлять is a very common verb with several meanings, including:

• to represent
• to present
• to introduce
• to imagine

So context matters a lot.

In Она представляет клиента, the most natural meaning is She represents the client.

But in other contexts:

• Позвольте представить нашего гостя. = Let me introduce our guest.
• Я не могу представить это. = I can’t imagine that.

This is a good verb to learn through context rather than as a single one-word translation.

It could in the right context, but by itself the sentence is more naturally understood as She represents the client.

If представлять means to introduce, Russian often makes the situation clearer by adding who the person is being introduced to, for example:

• Она представляет клиента директору.
  She introduces the client to the director.

Without that extra context, Она представляет клиента is commonly read as She represents the client.

Представляет comes from the imperfective verb представлять.

The imperfective is used for:

• ongoing actions
• repeated/habitual actions
• general facts

So here it can mean something like:

• she represents the client in general
• she is acting as the client’s representative
• she regularly represents the client

The related perfective verb is usually представить, but that often has different context-dependent meanings, such as to present, to introduce, or to submit, and its non-past forms refer to the future, not the present.

No, Russian word order is more flexible than English word order.

Она представляет клиента is the most neutral order. But other orders are possible, for example:

• Клиента она представляет.
• Она клиента представляет.

These alternatives change the emphasis, not the basic grammar.

Very roughly:

• Она представляет клиента. = neutral
• Клиента она представляет. = it is the client that she represents
• Она клиента представляет. = more emphasis on клиента

So word order in Russian often helps show focus and information structure.

No, Russian has no articles like a or the.

So клиента could mean:

• the client
• a client

The correct English translation depends on context.

For example:

• in a legal or business context where everyone knows which client is meant, English would often use the client
• in a more general statement, it could be a client

Russian leaves that distinction to context.

The stress is on -ля-:

• представля́ет

A practical pronunciation guide is:

• pred-stav-LYA-yet

A few useful points:

• the я́ is stressed
• the ending -ет is pronounced roughly -yet
• the consonant cluster at the beginning can feel heavy for English speakers, so it helps to say it slowly at first

You do not need perfect phonetics right away; the most important thing is to place the stress correctly on -ля́-.

Usually она means she, but grammatically it can also refer to any feminine noun.

So in a larger context, она might refer to:

• a woman
• a feminine-gender noun such as компания (company), фирма (firm), организация (organization), depending on context

For example:

• Компания представляет клиента в суде. Она представляет клиента уже много лет.
  The company represents the client in court. It has represented the client for many years.

So она is grammatically feminine, not necessarily biologically female.