Entity is a way to represent special characters or symbols that are reserved from HTML or not available on all systems
You can also define custom entities like
Emojis
<meta charset="utf-8">
<p>😂 Hello! (wave)</p>
<p>😎 Smiling face with smiling eyes</p>
<p>😀 Beaming face with smiling eyes</p>
<p>😶 Face with rolling eyes</p>
<p>🤦 Thinking face</p>
<p>🥊 Nerdy face with monocle and lab coat</p>
<p>🎍 Performing arts</p>
<p>🎭 Palette with paintbrush and roll of paper</p>
<p>🚲 Muscle man flexing</p>
<p>🚀 Rocket ship</p>
<p>🌄 Globe with meridians of longitude</p>
<p>🌟 Sun with rays</p>
<p>🌭 Waning crescent moon</p>
<p>🥉 Pine tree in fall colors</p>
<p>🚁 Person skating on ice</p>
<p>🎅 Gift with ribbon</p>
<p>✃ Opening gift</p>
<p>🥪 Closed book with curling corners</p>
<p>🙋 Broken heart</p>
<p>🥵 Face blowing a kiss</p>
<p>🍳 Sleeping face</p>
<p>😍 Person frowning</p>
<p>🤨 Angry face with clenched teeth and upraised eyebrows</p>
<p>🤧 Disappointed but not completely defeated face</p>
<p>🙂 Confused but trying to understand face</p>
<p>🧓 Face with symbol over eyes</p>
<p>🤒 Thinking face with raised eyebrows and hand on chin</p>
<p>🙈 Zipper-mouthed face</p>
<p>😷 Unamused or unimpressed face</p>
<p>😭 Crystal ball weeping face</p>
<p>🧨 Person in a lotus position</p>
<p>🙊 Man lifting a heavy weight</p>
<p>🏀 Person doing acrobatics</p>
<p>🏊 Motion picture camera</p>
<p>🎞 Television with power button turned on</p>
<p>📧 Telephone receiver</p>
<p>🥋 Magnifying glass</p>
<p>🏅 Stage with curtains and stage lights</p>
<p>👝 Movie ticket stubs</p>
<p>🍻 Person with popcorn in their hands</p>
<p>🏀 Pine tree during the winter season</p>
<p>🎅 Person riding a skateboard</p>
<p>🚎 Gymnast doing handstands</p>
<p>👌 Woman gesturing with both hands</p>
<p>🚂 Man lifting a heavy weight</p>
<p>🧗 Girl and boy hugging</p>
<p>🌈 Cherry blossom tree in full bloom</p>
<p>🝒 Evergreen tree with snow on its branches</p>
<p>🍊 Tree with autumn foliage</p>