A Garden Visitor06.06.2021 photo
According to the Woodland Trust:
"Dragonflies eat other insects, such as flies, midges and mosquitoes. They will also take butterflies and even smaller dragonflies. Prey is normally caught in mid-air, with the dragonfly using its long legs to catch its quarry. the food will them be carried to a perch where it is eaten."
Ancestors of present day dragonflies living 300 million years ago had wingspans of up to 28 inches: you won't catch me flying around the back garden!
(Picture taken with my OnePlus phone)
Edit: It's a damselfly! They do eat other insects and have many similarities to dragonflies.