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Technical Vocabularynoun · /hiːp/

heap

In simple English

In memory management, the heap is where programs allocate memory at runtime for variables and objects whose size or lifetime cannot be determined at compile time. Unlike the stack, heap memory is not automatically freed and requires explicit deallocation (in languages like C or C++) or garbage collection (in languages like Java or Python). In data structures, a heap is a complete binary tree that satisfies the heap property: in a max-heap, every parent node is greater than or equal to its children; in a min-heap, every parent node is less than or equal to its children. Heaps are commonly used in priority queues and sorting algorithms like heapsort. Understanding heap behavior is critical for writing efficient code and avoiding memory leaks.

What is a heap in programming and how does it differ from the stack?

At a glanceCEFR B2
Commonness4/5
Versatility4/5
FormalityCasualFormalNeutral
Spoken ↔ WrittenSpokenWrittenBoth
Directness ↔ DiplomaticDirectDiplomaticDirect
RegionUS and UK
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Say it like this

✓We need to optimize heap usage to reduce memory consumption.
✓The garbage collector manages the heap automatically in Java.
✓Be careful with heap corruption in low-level systems programming.

Real examples

in a standup

"We discovered a memory leak yesterday because we were not properly deallocating objects from the heap."

in a code review

"This algorithm uses a min-heap to efficiently extract the smallest element each iteration."

in a team meeting

"Our profiling showed that heap fragmentation was causing performance degradation on older devices."

Don't say this

Handle with care. Non-technical speakers may confuse heap (data structure) with heap (a pile of things). In tech, heap specifically refers to memory management, not a physical pile.

✕The heap is faster than the stack.
✓The stack is generally faster than the heap.— Stack allocation is faster because it uses simple pointer arithmetic; heap allocation requires more complex memory management.
✕We should heap all our data structures.
✓We should use heap data structures where appropriate for performance.— Heap is not a verb in this context; you use a heap data structure, you do not heap things.
✕The heap is limited by the program stack size.
✓The heap is limited by available system RAM.— Heap and stack are separate memory regions with different limitations.

Other forms

noun

heap

"The heap is where dynamic memory allocation occurs."

noun

heaps (plural)

"We use multiple heaps in this distributed system."

adjective

heap-based

"Our heap-based priority queue provides O(log n) insertion."

Often used with

heap allocationThe process of dynamically allocating memory on the heap at runtime.
heap overflowA security vulnerability where data exceeds heap boundaries.
heap corruptionWhen the heap metadata or data is unintentionally modified.
heap memoryThe total memory available in the heap region.
garbage collectionThe automatic process of freeing unused heap memory.

Similar words

dynamic memoryA broader term for memory allocated at runtime, not heap-specific.
free storeAnother term for heap memory, more common in C++ contexts.

Opposites

stackstatic memory

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Practice

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4 quick exercises

Pick the most natural phrasing

1. Your colleague is explaining why the application crashed. Which sounds most professional?

Complete the sentence

2. In Java, the _______ automatically manages memory by cleaning up unused objects on the _______.

Spot the mistake

3. Which sentence uses 'heap' incorrectly?

Rewrite naturally

4. Rewrite this in natural tech English: 'The place where computers put things that change in size needs to be watched carefully to prevent bad memory problems.'

Questions

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