In English, "each" and "every" are determiners, a type of adjective used to indicate the quantity or scope of the noun they precede.

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In many instances, the words "each" and "every" are, in fact, interchangeable. 

Michael spends two months in the Sea of Cortez every winter.

Caption 3, Nature Preservation: Saving Valentina

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The mule deer bucks are re-growing their antlers, which they shed each winter.

Captions 31-32, America's National Parks: Yosemite

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However, examining these words more closely, we can see that while "every" is used to refer to all items in a group without exception, "each" is often used to refer to individual items within a group, emphasizing them one by one. 

Every penny of which will help children all over the world...

Caption 41, British Airways safety video: director's cut

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So now, because every good meal requires vegetables, I have decided to add some tomatoes and some lettuce.

Captions 22-23, Abiventures: Sandwich

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In nineteen ninety-two, they started releasing them, each clearly numbered, into the wild.

Captions 16-17, America's National Parks: Grand Canyon

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So, each king not knowing about the others, set out to follow the star.

Caption 10, Children's Books Read Aloud: The Story of the Three Wise Kings

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Unlike "each," "every" cannot be used when there are only two items or people in a group.. If this ever comes up and you have to decide which word to use, pick the word "each." Note below that an airplane only has two sides, and only two people are being referred to with "each other."

There are six exits on this plane, four doors, two on each side.

Caption 43, Delta Airlines: In-Flight Safety Video

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Maria's mother and Clark looked at each other and frowned.

Caption 13, Basic Vocabulary: Common Words in Context

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Further Learning
You'll find many examples of "each" and "every" in use on Yabla English. 

In American English, "that" is typically used for restrictive clauses, which provide essential information about a noun. Often, the sentence will no longer be complete if you remove the word "that" and the clause that follows it. 

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In the first sentence, you can see "that" also used as a demonstrative pronoun, but we are interested in the first "that," which functions as a relative pronoun.

And I bought  a voltage converter that will convert that down to twelve volts.

Caption 39, Hobbies and Projects: The Electric Cargo Bike Project

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It's not too early to pack on the pounds that will get them through the next winter.

Captions 17-18, America's National Parks: Olympic

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Actually, there is one thing that Kate's always had a little trouble with.

Caption 43, ALF: Working my way back to you

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As a relative pronoun, the word "which" is reserved for non-restrictive clauses. These offer additional, non-essential details and are usually set off by commas. Note that in the examples below, you could stop the sentence before "which" and it would still be complete. 

And now for the final touch, which is the bread.

Caption 62, Abiventures: Sandwich

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One of the largest tributaries into the canyon is the Little Colorado, which joins the big river inside the park.

Captions 17-18, America's National Parks: Grand Canyon

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The mule deer bucks are re-growing their antlers, which they shed each winter.

Captions 31-32, America's National Parks: Yosemite

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Further Learning
Still wondering what a demonstrative pronoun is? No worries! Next month, we will look at "this," "that," "these," and "those." In the meantime, practice using "that" and "which," and look for more examples on Yabla English.