Onto is a preposition meaning "on top of", "to a position on", or "upon".
- Kaley climbed onto the tree limb, dangling precariously over the stream.
It can also mean "fully aware of" or "informed about".
- George realized Amelia was onto the surprise party he was planning.
Use on to as separate words when "on" is part of the verb:
- Alesha caught on to his scheme from the start.
- I'm going to log on to the program tonight.
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