Deposition means that sediment from weathering and erosion drops down or settles.
In terms of waves on Earth's surface, sediment can deposit in the ocean by sandbars and long shore drifts. Sandbars are the result of sand particles pilling up in the ocean.
Deposition can happen by wind too. Sand dunes are one example. The sediment settles on top of existing sediment and builds a pile over time. This is a picture of a sand dune. in a desert.
Rivers and streams deposit sediment by bringing it from another location and dropping it into a lake. This also can create deltas and alluvial fans. This is a picture of a river depositing sediment into a ocean from the Nile.
Glaciers deposit sediments after breaking it off and moving to a new location. This is a picture of a glacier deposition that left behind pebbles, dust, and large rocks.
Gravity also deposits sediments after a mudslide or a landslide. The events push sediment to a new area. In an landslide like this one, the sediments were being deposited over a structure.