These are just some of the genres in the last 20 years that have been created. There's a lot more. I'm not organizing these by cultural origins.
Trap
Originated in Atlanta in the early 2000s; distinctive fast hi-hat sound and heavy bass at moderate tempos.
Detroit Trap
Emerging in Michigan during the 2010s and incorporating upbeat 808 percussion derived from Trap music and dynamic, off-beat flows from rappers.
Drill
Originated in the South Side of Chicago in the early 2010s, distinguished by a heavy influence from the local Footwork style in its drum programming and a distinctive monotonous, drawling flow that is usually at least partially auto-tuned.
Bop
Grew out of the Chicago Drill scene in the early 2010s, characterized by autotuned vocals and upbeat synth melodies.
Sample Drill
UK Drill rhythms applied to more traditional Trap and Plugg percussion, using melodic and recognizable samples as the main compositional focus.
UK Drill
Deep bass and complex rhythm which denotes a Grime influence in the production.
Futuristic Swag
Playful, Snap-influenced and party-oriented.
Phonk
Influenced by an array of Hip Hop, including drum programming and other prominent features of 2010s Trap and percussion sounds and vocal samples of Memphis Rap.
Plugg
Use of sparse and minimalistic drum and hi-hat patterns, subby 808s and heavy low end, piano samples, airy pads, and icy synths.
Trap Metal
Features loud, distorted 808s and basslines, as well as aggressive vocals that are usually yelled or screamed.
Tread
High-tempo production, usually set around 160 to 190 BPM, icy synths, busy drum programming with distinctive 808 patterns, often implementing off-beat hi-hats in addition to trap's triplets and a fast style of lethargic rapping.
Dubstep
Characterized by half-time syncopated and sparse beats set around 140 BPM with heavy sub-basses; emerged in South London in the early 2000s.
Brostep
Offshoot of Dubstep which replaces its sub-bass-oriented sound with an emphasis on catchy or aggressive mid-range melodies.
Colour Bass
Combines aggressive wobbling basses with the euphoric drops of Melodic Dubstep and Future Bass.
Deathstep
Darker, heavier form of Brostep that uses "machine gun" basses, atonal synths, and elements from genres like Death Metal and Metalcore.
Drumstep
Dancefloor-friendly, loud, and heavy combination of the drum programming of Jump-Up with the half-time tempo and midrange LFO wobble of Brostep.
Riddim
Heavy use of repetition, wet and metallic sound design; frequently pulls inspiration from older Dubstep.
Chillstep
Relaxed Dubstep influenced by Downtempo and Ambient.
Dungeon Sound
Commonly features dark textures, spatial production, and midrange basses.
Melodic Dubstep
Melodious, tuneful drops, rich, lush synth leads, powerful stretched chords, and light and harmonious sound design.
Purple Sound
Emerged in the late 2000s out of the Dubstep scene of the time, incorporating synth leads and basslines inspired by 1980s Synth Funk and 1990s G-Funk, and Video Game Music, into a rhythmic palette mostly derived from dubstep and Grime.
Vapor
Meta-genre beginning with the rise of Vaporwave and the aesthetics that it spawned.
Dreampunk
Accentuates ambiance and a dreamy atmosphere within Vapor.
Future Funk
Sample-based form of House which formed out of Vaporwave in the early 2010s.
Hardvapour
Influenced by Hardcore [EDM] and Techno and made in response to the Vaporwave movement.
Utopian Virtual
Born out of Hypnagogic Pop that emulates late 20th century futuristic and corporate aesthetics, often using "tacky"-sounding MIDI-esque instruments, in contrast to the looping, sample-based approach generally found in Vaporwave.
Vaportrap
Incorporates a blend of Trap percussion set to the re-utilization of old samples, such as 1990s pop culture or old computer library sounds.
Vaporwave
Sample-based, involves heavily synthesized and processed manipulation of corporate mood and background (elevator) music; though source material can also include genres such as Pop, Contemporary R&B, and Synth Funk.
Broken Transmission
Uses samples taken from TV broadcasts, advertising, film, radio, and other sources - often slowing down and manipulating the sound heavily.
Mallsoft
Blends the main characteristics of Vaporwave with what can be described as background/elevator music.
Wave
Heavily influenced by 2010s Hip Hop production, characterized by dark, icy, nocturnal, and melancholic beats.
Hardwave
Harder, festival-oriented offshoot of Wave, combining its "reese" basses and icy synths with Trap [EDM] drum patterns, build-up-drop structures, and fuller sound influenced by Trance and Hardstyle.
Witch House
Nocturnal, occult-themed/horror-inspired, and murky beats with altered, slowed down and heavily processed samples laid on top of slow Hip Hop-derived drum rhythms and droning, dense synthesizers.
Minatory
Extreme, experimental style forked from Deathstep, with a harsh sound and sudden BPM changes.
Digital Cumbia
Mixes an Electronic sound into traditional Cumbia through influences from House, Dancehall, Hyphy, and Dubstep.
Electro latino
Originated by DJs in Dominican Republic during the late 2000s which adds a Latin twist to the global Dance-Pop sound.
Electrotango
Combines Tango rhythms and melodies with Electronic.
Nortec
Samples and synthesizes Mexican styles like Banda sinaloense and Norteo into a sound related to IDM and House.
Tribal Guarachero
Mix of traditional Hispanic American Music and Indigenous American Traditional Music with House and Techno influences.
Chillwave
Hazy, reverb-drenched atmosphere and lo-fi aesthetics; originated predominantly from the United States in the summer of 2009.