Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
that serves as
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "that serves as" is correct and commonly used in written English.
You can use it to indicate the function or purpose of something. For example: - The table in the living room serves as a makeshift desk for my laptop. - The statue in the park serves as a memorial for fallen soldiers. - The blue book on the shelf serves as a reference guide for new employees. - The park serves as a popular picnic spot for families on weekends.
✓ Grammatically correct
Science
News & Media
Encyclopedias
Wiki
Alternative expressions(20)
that functions as
which acts as
that constitutes
that contributes to
which is useful for
that facilitates
that is designed for
which is used for
which serves to
which helps for
that is indicative of
that demonstrates
that signifies
that mirrors
that indicates
that embodies
that serves
that contributes
that corresponds to
that illustrates
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
58 human-written examples
It is a flat piece of wood that serves as the base for your super.
Wiki
It is shipped to the purchaser in a case that serves as a launching tube.
Encyclopedias
Think about the scene that serves as the book's centerpiece.
News & Media
The result is a biography that serves as political history.
News & Media
The repressor inactivates a promoter that serves as the output.
Science & Research
The hourly weather generator that serves as the downscaling tool is briefly presented.
Science
She gazes into the flame of a candle that serves as the only light source.
News & Media
He won the corner of the state that serves as the northern dormitory for Boston.
News & Media
It's a cable business-news outlet that serves as a tonic for beleaguered tycoons.
News & Media
Bladder, membranous sac in animals that serves as the receptacle of a fluid or gas.
Encyclopedias
Human-verified similar examples from authoritative sources
Similar Expressions
1 human-written examples
CCNE2 encodes a protein similar to cyclin that serves as regulators of cyclin dependent kinase (CDK).
Expert writing Tips
Best practice
When using "that serves as", ensure that the noun following "as" clearly and accurately describes the function or purpose you intend to convey. For example, instead of 'that serves as a thing', specify 'that serves as a catalyst'.
Common error
Avoid using "that serves as" with overly general or unclear nouns. For example, instead of saying "that serves as something important", specify the exact importance or role it plays to enhance clarity.
Source & Trust
81%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "that serves as" functions as a relative clause introducing a description of the role, purpose, or function of a noun. Ludwig confirms this through numerous examples demonstrating how it connects a subject with its functional attribute.
Frequent in
Science
36%
News & Media
34%
Encyclopedias
15%
Less common in
Wiki
9%
Formal & Business
3%
Reference
3%
Ludwig's WRAP-UP
In summary, the phrase "that serves as" is a versatile tool for specifying the function or purpose of a subject, and it is grammatically sound as per Ludwig. It finds frequent use across diverse fields like science, news, and encyclopedias, maintaining a generally neutral register. Ludwig's examples highlight its effectiveness in defining roles and functions, while related phrases like "that functions as" and "which acts as" offer nuanced alternatives. When using this phrase, ensure clarity by specifying the exact role or function. With its widespread applicability, "that serves as" is an indispensable component of effective communication.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
that functions as
Focuses on the action or operation performed.
which acts as
Highlights the role or capacity in which something operates.
that works as
Emphasizes the practical application or effectiveness.
that provides the function of
More explicitly states the provision of a service or role.
that fulfills the role of
Stresses the completion or satisfaction of a specific duty.
that constitutes
Indicates that something is equivalent to or forms something else.
that is utilized as
Highlights the act of using something for a specific purpose.
that is employed as
Similar to "utilized", but may imply a more formal or deliberate use.
that operates to
Focuses on the intended action or effect.
that contributes to
Emphasizes the part played in achieving a larger result.
FAQs
How can I use "that serves as" in a sentence?
Use "that serves as" to specify the role or function of something within a sentence. For example, "The library "that serves as" a community hub offers various resources and programs."
What are some alternatives to "that serves as"?
Alternatives include phrases like "that functions as", "which acts as", or "that works as", each emphasizing a different nuance of function or role.
Is it better to use "that serves as" or "which serves as"?
Both "that serves as" and "which serves as" can be grammatically correct depending on the context. "That" is typically used in restrictive clauses (essential to the sentence's meaning), while "which" is used in non-restrictive clauses (adds extra information but isn't essential).
How does the formality of "that serves as" compare to other similar phrases?
The phrase "that serves as" is generally considered neutral in formality. More formal alternatives might include "that fulfills the function of", while less formal options could be "that acts like" or "that works like".
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
81%
Authority and reliability
4.5/5
Expert rating
Real-world application tested