1.
real; realistic
Lifelike, authentic, or based on reality.
2.
relatable (slang)
Something that resonates or feels true to one's experience.
リアル is a na-adjective with multiple meanings in modern Japanese, ranging from "realistic" to contemporary slang uses.
Usage by meaning
1. Realistic/lifelike: Describes graphics, art, or depictions that closely resemble reality
2. Relatable (slang): Young people use it to mean "so true" or "I feel that"
3. In real life: Contrasts online/virtual with the physical world
Common expressions
Note: The slang sense 2 (relatable) is particularly common among younger speakers on social media. In formal contexts, stick to sense 1 (realistic).
Related Words
Antonym:
バーチャル (virtual)
Related:
現実 (reality (noun))
Compare:
リアリティ (reality, sense of realism)