There are different terms to understand before we are to understand genderswapping.
Firstly let me highlight, what we don't mean when using this term. there are other terms that often collide with peoples perception of gender twisting, and these are used in lots of different communities.
Gender-bend
This I when someone takes a fictional or non-fictional character and change its appearance to be perceived as the other sex. by this we could take the previous president Barack Obama, and turn into either a nonbinary or a female looking version. This behaviour is often seen in the more fictional fan universe.
Here people make characters like Yoda from the Starwars universe, bent into a female or example wise making Laura Croft from the Game Tomb Raider, into a Male version that has pecks instead of the breast, and a broad upper body instead of a tiny waist and wide hips.
Cross-bend
This term covers the opposite and means impersonating someone else. Here it's more used as a costume for oneself, where the person underneath the dress, truly is to cover there gender to convince others, that the wearer truly is the person they are impersonating. As an example, we could have a female wanting to impersonate Elvis Presley the king of rock n' roll. When doing so, she would have to wear a band that should minimise her break area, tugging her (if long) hair up into a small bun, so she could have a short black wig on, in the style of the bambage that is the iconic hairstyle of the fifties. In short, this means to cover yourself fully up and to be looking like another person or character as much as possible.
Gender-swapping
This is head-on when focusing on multiple possibilities in having an avatar. genderswapping is almost self-described in the word. Here there is a focus on changing or pretending to be another gender. As the https://www.yourdictionary.com describes genderswapping as: "The practice or act of assuming different sex and/or gender identity than one's actual sex and/or gender identity, especially in a virtual setting" (12.11.2019). This, therefore, means that a gamer has the possibility to easily hide their gender behind a non-psychical character, and the digital avatar has no restrictions on what gender the gamer chooses to express themselves through.
Genjika
As an extra term, that could come up when getting involved in the world of avatars is the Genjika style. this is the most abstract one and can be described as following. Non-humanoid characters will as genjika versions be given features as a human to seem more relatable and humane in the eyes of other living and thinking humans.
For example in the Disney movie Zootropolis from 2016, all the animals in there are given human features except when they go savage, where they are bach to the animal primal stage of only to follow instinct.